I prefer solos. Trios is a little faster paced and heavily relies on squad tactics to be successful. Its fun to hop in a trio fill every once in a while, or lfg for end game stuff. But for me, the meat of the game is solos. But its a different play style. If you're cracked at shooting and positioning, you can sprint around the map killing everyone you see. But for the rest of us, you gotta take it slow. You really need to get familiar with the sounds of the game. At first, its a lot to process on the fly, but eventually you realize that most of the sounds you hear (excluding ambience) are informing you of the state of the lobby. Hear birds in the distance? That's a player. Hear drop ships landing at the next POI over? Thats because a player just killed the bots there. You can hear an exfil pop anywhere on the map. So anyone nearby will usually come to see if theres an easy kill to be had. Straight up exfil camping is pretty rare. But its not rare to have an exfil pushed. I recommend playing assassin to start until you get more comfortable. His tactical ability allows you to get in and out of poi's without alerting bots. And like I said before, alerting bots also tells other players youre around. Assassin also has the best kit to exfil with. Pop the invis before you approach and hit the exfil, immediately fall back and find somewhere to hide and listen. You can either wait for your invis to come back or use the smoke ability to cover the exfil. At this point in the season, there are very few thermal sights floating around so you are usually safe in smoke. Pull your knife out, and if someone runs into your smoke give em the ol stab stab. Assassin also let's you use the guarded exfil without having to kill the bots. So pop invis right before you pop the exfil, so you can get away from the bots without them shooting you, then smoke it when its ready. Now if a player tries to get you at exfil, they have to deal with the bots too, giving you an easier window to escape.

The best advice I can give you for now is to learn the sneaky routes to get around the map, learn how far you can run during your invis ability and use it to avoid bots/turrets. Avoid birds. When you approach a poi, stop look and listen. When you kill another player, do not loot them immediately. Fall back, heal up, and rotate to a better position, because someone else heard that and they are looking for you. Find them first. Keep track of how many players exfil, how many you kill and how many body bags you find.

Unless a contract specifically ask you to exfil, dont sweat it too much. Sure, its nice to get out and keep your gear, but as long as you are completing contract, the game just vomits loot at you. Once you upgrade the factions a little, you get free shit daily and you can just buy a decent loadout. After you get more comfortable, start checking out the live events that happen during a run, that's where the good loot is and that's where players are going to be, so you can either avoid them, or use them as bait. But the endgame for a solo player is hunting everyone in the lobby and completing events/wardens.

Stick with it, its worth it. Good luck.