COD Mobile. Until last year, I used to play Fortnite, then quit. Now, I generally play tons of COD Mobile. Considering the current world condition, there's a lot of free time to burn.
Fornite for me on Nintendo switch, I personally think season 2 wasn't great and very much looking forward to season 3 when it finally arrives, I agree with past 2 setbacks due to the current situation.
You didn't mentioned platform. But if mobile is what you are targetting. I'd go with PUBG and FreeFire for the android. In case of PC, I guess Fortnite takes the punch. Also Valorant and CODs Battle Royale too is good enough. But I personally don't like Apex legend much, too fast for me.