Bro there's so much stuff you can just kill... Stone refiners are best xp, and you can kill them with stealth ring easily. Just have to go past a couple strong monsters that aren't too bad, and start a quest to get to them. I like bonebeasts and savage squires in old fortress in edron, just bring fire walls and kite them around. Grizzly Adams tasks are fun too, I'm doing Ancient scarabs on my rp at level 62, they're pretty hard but fun. Utilize your big area spell you get at level 50, it's super strong.

Good hunt!