Honestly no. The biggest chunk of XP a day you can get is from your leveling roulette (dungeon)
After roulettes If youre looking for non-group content, fates, hunt logs and side quests (though most don't give much at all).

I guess maybe squadron dungeons you could look into, but the best xp really comes from dungeons and potd.

Or you can buy job jump potions.

Unfortunately, this is an MMO so group content will always be required in some form.