since I have issues with FPS

Frame rate or first person shooters?

I don't like playing solo on games like these

I recommend hoping on the mic or using textchat. You will meet some really fun people. There are clubs you can join now for either competitive or casual people so you can request club members to join your party. They recently added a "Stay as a party" which after a match, does as it implies without adding them as friends. Additionally, you can find people in The Finals discord server with an active linux thread too. You have options. I totally get not wanting to talk to people so I use textchat a lot. Ultimately, if it's still a dealbreaker then not much to say but we both tried.