Move class/job quests to the top of your priority list! They gate many of your skills.

I would add pixies (70-79) and Arkasodara (80-89) tribes. Also daily hunts for Shadowbringers and Endwalker. These feel like a really good deal for time spent vs. exp. gained. You can do the tribes/daily hunts for earlier level ranges as well but they don’t feel as rewarding.