I really don't think this game needs full lobbies every match

It's an extraction shooter, but every match plays like TDM where you count down the teams that you've killed until you reach 0 players on the map. You can still create tension if you dropped the number of teams to only having 1 enemy team on the map or even 0 in some cases. You could make rooks on the low player count maps buffed with better gear like a purple shield, satchel of grenades, and signal jammers (all compromized or fragile). Less teams per map in a random fashion would also make skill based matchmaking work at low player counts and grow the player base.