Go for the Shin Megami Tensei games, (not persona) they're grindy as shit and with a cool setting, music and design to boot. Nocturne is a good one to start with, or get the translations for the previous ones. Strange Journey is awesome.
Any suggestions of grindy games to play? currently on leave from my job and need to fill the void
Liam Reed
Jose Sanders
RDO is a good comfy quarantine grinding game
Connor Adams
Play Digimon world 1, it's fun.
If you just want to loose your time doing repetitive stuff play the dawn/dusk DS games and try to get your favourite digimons. Shit is grindy as fuck but not very fun.