Hey this is just a suggestion but why dont you have sonthing like a system event where he can give a lot of people the chance to win a zanpakuto. It would be a nice change to the one piece world and would be pretty interesting to see multiple characters with their own zanpakuto. Also it would be pretty interesting cuz in the naruto version of this book the mc didnt really spread devil fruits
I'm curious to know Olvia's reaction when Robin appears at the end of this bounty hunter island mini-arc, or Rouge's reaction when ace appears at the beginning of Alabasta (she must be pretty hateful of Rob if she listens to his thoughts and knowing her son is going to die too, a good woman but too sentimental, she knows he kind of knows the future but still blames him), sometimes I feel like Doflamingo will still be the same as Canon, the personality looks almost the same.
for the next manga That you take out in One Piece that is the one of shumatsu no valkyrie because there so that they understand How the gods would act with humans if they existed, especially the ideology of Poseidon the fight and rivalry of Lu bu housen and Thor in especially for fallen for that they say I understand their emotion of a death in battle and the other participants
While the story is not bad, I feel like the author has made the mc so OP that he has already touch his ceiling. He has no match in the world and noone can opose him. He can do anything he wants in the whole world. Now the only thing that the story can show is the release of new chapters, and while at the begining it was interesting, by now it is starting to get boring. Also, I can understand how the One Piece manga would be able to grab everyone's atention, but mangas like Bleach and the rest, while they may be interesting for some people, many would not care at all. And most importantly, noone with half a brain would try to develope new techniques based on them.