One Piece is great, but it is a big investment. Worth it IMO. If you're not sure, watch the Netflix live action. It's only 8 episodes and is pretty faithful to the original.
3 more years tops. Iirc he mentioned he has one more arc in him. Historically they're 2ish years long give or take. So just a bit longer and we'll get to see how the one piece was the friends we made along the way.
Yeah “faithful” isn’t what I would call it but your comment is a huge exaggeration and I hope you know that. I’d struggle to find western adaptations that change less stuff than what the OP LA did.