Usopp hasn't had many significant power-ups in One Piece. The Sniper King has been struggling to keep up with the rest of the crew. Usopp may not need a power-up to become a brave warrior of the sea.
Almost all the old Usopp's flaws have been repurposed or outgrown ... saves and puts a huge amount of emotional investment in the crew and Luffy's dream. Not just that, but later on in the ...
Which is why when that came to a boil against Luffy, he not only disrespected his captain, but left the crew for a while. One Piece isn't shy about showing why Usopp's insecurities prevented him ...