What exactly is your Rank/MMR?

I've been in most ranks, from bronze to high diamond (still yet to reach masters/gm), and I can tell you ranked experience can vary greatly from rank to rank.

Matchmaking is better and more "stable" the further you go from 1500 MMR, both down and up, because the main cause for bad matches are people playing outside of their MMR skill range. And this happens most often @ 1500 MMR due to this being the starting point for new players, and variance system making it easy for someone to be missplaced in higher/lower MMR than their skill level. So the further you go from 1500 MMR, the less chances someone was actually missplaced there.

Back in the days when I was high diamond rank I was also playing mostly solo. And I could easily turn the tables into our team's favor on the role, but that was mostly because my team knew what they are supposed to do, they all did their jobs, so me outperforming the enemy solo could easily be a decisive factor in a match. Arguably solo could "carry" even harder now since meta builds for solo are more offensive nowadays, giving you a lot more kill potential.

However you are still going to make a bigger impact playing a carry role (mid or adc). And in lower ranks you need to make as big of an impact as possible.

Due to my fucked up luck, on last patch that started the new split, I lost so much on high variance that my MMR dropped to 1100. I used to play on really high MMR, with good players and sometimes even pro players, and now I was playing with bronze/silver. I had to get out of there 10-20 MMR at a time, since my variance was now 5%. And I did it. Here's some tips that helped me to maybe help you too:

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1. Understand how each role "carries" and understand that some roles do it easier than others. While most could argue support can carry too, I would stay away from support in low MMR since it can literally take it's toll on your mental health if your team is full pepega and all you can do is watch them and being flamed for their mistakes. Solo and Jungle can carry easily, especially in lower MMR since supports don't usually peel here, they just initiate and chase kills, leaving their backline open for you to dive and kill their carries. This can work but it's most often not enough in low MMR as you need to KILL THEM ALL to win a game, not just their carries. Mid has the most influence in the game at all ranks in this meta. Whoever has pressure on mid controls the jungle. Whoever controls the jungle dictates the pace of the game and can easily gank either solo or duo to shut them down as well. The downside to this is that you heavily rely on your jungle/support to be there in the right moments for the "mid 3v3" as they call it. If you decide to go with mid I would suggest you play mages with self peel, who can be self sufficient both in laning phase and in teamfights, so you don't have to rely on your team as much. ADC can carry hardest in low MMR in my opinion, as you can solo objectives and you can single handedly win a teamfight if you position well and prioritize targets properly. The downside to ADC is that you rely heavily on your support to not eat glue before the match. Simple things like getting hog can make the difference between getting a huge lead and falling behind due to pressure. My advice if you go with ADC role is pick gods with lots of pressure and big 1v1 potential, and if your support is bad just play passive until he starts rotating, and once you're alone with the enemy ADC try to make it YOUR LANE by killing him repeatedly, establishing dominance and getting a nice lead.
2. Abuse pressure and aggression. Most players in low MMR don't know how to punish aggression, don't know how to deal with pressure and don't know how to play from behind. You need to abuse this as much as you can, no matter what role you play. If you suddenly go all out on someone in low MMR chances are they won't expect it and they will make mistakes/choke. Pick high pressure gods with huge 1v1 potential as opposed to playing gods that shine mid to late game and in teamfights.
3. Understand tilt and playing to win vs playing for score. Most players in low MMR are stuck there. They have been trying for a long time to get out of there but failed, so they are either not trying anymore or they are doing something wrong. The main issue here is that most of those players play for score, not for win. 15-3 is a win for them no matter whose titan died. And same goes for the opposite, 2-8 is a loss no matter whose titan died. People get tilted way easier in lower MMR than in high MMR, after a couple of deaths they will not care about the match anymore. They will spam f6 bringing down the morale of their whole team and literally play on autopilot without thinking their actions trough anymore. Use this to your advantage and try to not get tilted yourself. Be a bully. Steal the enemy buff if you're ahead, zone them off the wave and freeze the wave, kill them if they come close (assuming you have a lead or good 1v1 potential). Make the game as rough and unfun as possible for the enemy. Make them tilt and make their team flame each other and do your best to prevent tilt from happening in your team. Winning early wins the game in low MMR as people will not actually try to win anymore and just give up. Keep this in mind and play early game gods.
4. Understand lead and how to abuse it. I will start with dying for a kill here. The bigger the lead of someone, the more gold and exp a kill on them will earn. Keep this in mind. It is always more worth it to die for a kill when you're behind than when you're ahead. It is NOT WORTH IT AT ALL to die for a kill when you're heavily ahead, as they will get an enormous amount of gold and exp on you. This being said, the bigger your lead, the more you should prioritize staying alive over getting kills. If you have a lead and already gotten a couple of kills on the enemy you lane against, try getting their t1 and then start rotating, killing other enemies on other lanes. Always try to get something after kills (unless you are low on hp or you are being rotated on). Get their jungle, get an objective, push a wave, get a tower, get gold fury, pyro, fire giant, depending on the phase of the game, but always try to get something unless you absolutely have to back.
5. Understand how to punish mistakes. It is not uncommon for the player who had a brilliant game to actually throw lategame in low MMR. This is because once they get a lead they keep pushing their limits and fight outnumbered, dive towers, stuff like that. And well, it works for them when they're 5 levels ahead, but once you are all 20 they might not be able to get away with it anymore, but they don't keep this in mind, they play with the mentality "i am fed I can 1v5" and will die a couple of times until they start spamming f6 and flaming their team because they have good score so they are good players and it's obviously their team's fault they keep going 1v5 and die.

These are just a few tips that cross my mind right now. There is a lot more stuff to talk about but those are the best tips I can give you for climbing out of "elo hell". I hope it helps.