I Left My A-rank Party To Help My Former Studen... (PC)

I didn’t argue. I just packed my staff, nodded to the leader, and left the A-rank table for good.

My old party wanted firepower. My students want a future. I Left My A-Rank Party to Help My Former Studen...

If you’d like a short “piece” — like a dramatic excerpt or a monologue in the protagonist’s voice — here’s one: “They called me a weak link. The lowest damage in the party. A relic who’d hit his ceiling. I didn’t argue

But here’s what they never understood: I wasn’t teaching my former students to replace me. I was teaching them to surpass me. My students want a future

It sounds like you're referring to the manga / light novel series I Left My A-Rank Party to Help My Former Students Reach the Dungeon Depths! (sometimes shortened to I Left My A-Rank Party... ).