It helps to have friends who play. Unlike PUBG, everyone on the team has a specific role to play. Communication is important. Casual pickup games can be a mess.
Team killers (ppl who r just bored) usually dominate casual multiplayer. And ranked matches consist of those who take the game wayy too serious and u begin to wonder if Siege is the ONLY game in their library
There's a decent discord group, I think it's tied to the reddit group. Google it. It has some good LFG channels for various regions to find likeminded casual or competitive players.
I hardly get team killed on siege. TKing is mostly a console problem if im not mistaken. Its a great tactical fps. HUGE learning curve. Practice aiming and lower your sensitivity if you get it.