To level up Blox Fruit mastery fast, start by grinding on Fountain Island. This location is great for beginners and can level you up by about 10 levels. It’s a good spot to gain combat mastery quickly.
Next, aim to kill Thunder God in the first sea. Thunder God gives a lot of experience, around 100,000 exp, and is easier to defeat than Cyborg bosses. This will significantly boost your mastery level.
For the second sea, farm the Awakened Ice Admiral. This boss gives more mastery than the Tidekeeper and has fewer players hunting for it, making it an efficient choice for quick leveling.
In the third sea, use the AFK method with a Buddha fruit. Employ a Buddha glitch and auto-click on a roof to gain experience while you are away from the keyboard. This method is effective for gaining mastery without constant attention.
To optimize your efforts, server hop to find the best locations and avoid bounty hunters. Max out your fruit skill points to increase mastery gain, and farm bosses or visit Cake Island to group up enemies and earn lots of cash and mastery. Consider using private servers to autoclick and avoid being reported and banned.