Usually it's the audience involved. Now, lately it has been "if many members of the CR3W are raving about it, then I'll give it a go" but in the past, if folks I talk to regularly are into it then I'll consider it. OR if what seems like a large amount of the public loves it, then I'll try it (ie: Fortnite after Ninja/Drake/Travis Scott/JuJu).
Otherwise, if it's a game with characters I recognize then I'll try & give it a go.
The most influential thing that motivates me to buy a new game though is a demo. If I can play it beforehand, then I'm more likely to buy it. That & a sale.
Also to note: I will give it a 100% go, not a "one foot out the door" approach. If it doesn't capture me, it doesn't capture me. Nothing against the game or the people who like it. I stil want to try & get into
@splatoon-3 but ... it just hasn't done anything for me in the past.