Starship Troopers: Extermination is PvE wave/extraction shooter, from the company that developed Squad. Looks pretty fun but if you are not into that universe nor have enough friends you'd need to rely on other players as well.( basically max 12 players in 3 teams atm.) Warning: early access so if you are not tolerant to EA type of development/update cycle just avoid.

There is a couple other PvE wave/extraction shooter as well, so give them a try.( Just google that term, usually around $30 and could go on sale.)

Rocket League, this one I played since launch and really good game to start before your group all come online and then move on to other games.(since it supports up to 4v4, but usually people only queue 2v2 or 3v3 matches.)