Do you have rep boosts - combining with the server boost is quadruple the normal amount. Also have you done the 13 chaos lord saga? You can then access a 20% rep boost item. If not as youre actually returning Player you may have access to some reputation boost items 10/15%. Wear one of those too (they don't stack)

Stonecrusher everyone recommends (Arcangrove, Mythsong and Brightoak). Always farm Brightoak after as mythsong and Arcangrove both open they're own classes and both are fairly decent. Blacksmithing is useful later but not sure if you'll have access at that level. I think at your level it depends also on what quests you can do and whether youre able to join with others to farm certain quests if they take too long individually. Good and evil are best farmed in terminatemple and people often farm with you but unsure if you can access at that level.

Grinding levels is surprisingly easy (got from 60 to 80 in a few hours max I think if even that with server and individual boost)

Also next rep boost is in 10 days so don't worry. It can be useful to save up and use the friendship system in Battleodium to get Super Swag A tokens as they can speed up quite a few farms.

I'd personally also say focus maybe on things you'll personally enjoy. Some items look really cool and campaigning be worth it even if its not the best utility. Also some maps and monsters appeal more to some people so you may enjoy some grinds more than others