I know how to solve all of those problems
Lag: wired internet (if you can’t do that idk)
Bad teammates: party with your friends instead of randoms, or randoms that are decent, non-toxic, and don’t lack basic communication skills(if they don’t have mic, then they can use markers and those weird pop up emotes that are only available in game showing an ammo type)
Bad aim: find a practice map in creative, where you can just fight zombies or something
8751-3949-6922 This is a map code for one of my favorite maps, it’s basically cod zombies in fortnite.