Everyone who sees this will probably understand (this post is for beginners). As long as you complete the main storyline and bounty quests, that's all you need to do. Perhaps by the mid-game, only bounty quests remain.
At this point, you can try challenges. Currently, challenges are divided into four level brackets: 6, 11, 20, 32.
This does not mean that just because you are at this level, you can pass. It is recommended to team up or find an expert to lead the team, while you just need to stand aside and wait to pass and gain experience.
When there are no quests to do, this place is currently the best way to farm experience.
Summary: The above is a post specifically for beginners.
