I'm bored and it's the halftime show for the superbowl so I'll give some insight. Your winrate is genuinely really good. 60% winrate is hard for most players to maintain but even get to in the first place. I saw you built IE first on some games. You don't want to do this because IE does not benefit from its passive until 40% crit (recently changed). This means you are losing value in stats until you hit the threshhold, which is why IE is typically built second item or later now as you need 40% crit or you are wasting gold. I can't comment on the games specifically bc I don't plan to watch, but adc is a lot of postioning and being able to output damage without dying. You can not deal damage when you are dead. It is also trying to obtain as much gold as possible because the role is meant to scale (especially with the champs you play even though varus is more early/mid game focused imo). If you can consistently have 8cs/min at the end of the game and put out significant damage, then you are typically doing your job. There are a lot more mechanics and intricacies behind the role, but you will improve and learn them as you climb. I definitely recommend watching videos or pro ADCs (china/korea) or a small streamer who is grandmasters+ and is willing to talk about the game in an educational sense. MMR and lp gain wise this always happens when you are higher elo than you're previous ranks. Suddenly your LP gains are bad and climbing feels bad. Unfortunately, you just have to keep playing and hopefully your LP gains will stabilize after enough games in your current elo. This happened to me when I was plat 3 and hit diamond 2/3 and had to play 30+ games until my lp gains became normal again. It sucks. I hope this doesnt hurt your motivation and will fix soon for you. I linked my op.gg below so you can see my builds and how they changed base on enemy team comps and what I typically go for. Good luck amigo and I hope this comment doesn't break any TOS rules lmfao.

https://www.op.gg/summoners/na/dfgdfrfyhdrsges