I'm a fan of JRPGs as well and I finished Octopath right until the final hidden boss, here's my recommendation:
1. Shin Megami Tensei V - actually I bought it but have yet to play.. I like it because of #2
2. Tokyo Mirage Sessions - a bit underrated, but fun mechanics nonetheless. This is why I bought SMTV
3. Dragon Quest XI - my favourite JRPG at the moment, completed the game and post-game as well.. took me well over 120 hours... and I have not even touched the 2D parts
4. Live A Live - similar art as Octopath, have not played it as well, but planning to soon. Heard good reviews about it

Playing Final Fantasy 7 Remake on PC at the moment, then gonna play Live A Live and SMTV.

Looking forward to Persona 5 and Nier Automata on Switch.