Then I think the simplest option available is to just repeat the lv60 dungeons you do have access to, for more Esoterics gear, replacing your most outdated gear slots first and working up from there.

If you don't have access to the Lv50 roulette yet, it might be fun to go back and complete the old dungeons you missed to get that roulette open. Completing the lv50 roulette on a lv60 job rewards Esoterics.