>>532022304
I wouldn't. PVPs are cancer for gacha since they somewhat legitimize meta-faggotry.
That said, if you had a gun to my head and told me I needed to add a new community interaction mechanic, I'd probably add a club system with ranking.
You can join a club, with maybe 100 or so people max. Whenever you play, you earn points (for the sake of convenience, let's say it uses bond point values 1:1). All clubs are ranked by their total bond points earned every week or month. Being above certain values collectively earns materials and SQ.