Though I wish I could just play EVERYTHING on the Switch, I did finally snag a PS4. I think I'm going to get Persona 5 Royal, Tales of Berseria, Yakuza: Like A Dragon, and Final Fantasy XV to start with (I already have my brother's copy of 7 Remake).
Yes, Tales of Arise has the pretty graphics and incredible looking combat, but I find the premise of Berseria to be so much more interesting, so I'm going to play it before Arise.
Persona 5 Royal, Tales of Berseria/Arise and Yakuza: Like A Dragon are all absolutely excellent games, so you're off to a great start. Final Fantasy XV is... not absolutely excellent, but it's still worth playing for a FF/RPG fan. In terms of PS4 JRPGs that aren't also on the Switch, aside from the ones you listed, the two Nier games (Automata and Replicant) are must plays too. The rest of the Yakuza/Judgment series is definitely worth checking out if you like Like A Dragon too, though unlike that one, the other titles all action games with RPG elements rather than straight-up RPGs.