I think the bounties will increase after the curent saga and not arc:
luffy: 575M, because it's been 2 years, the marines saw his power, learned that he is the adopted brother of sabo (second most powerful person in the revolutionaries) and untill the end of the saga he is going to take down donquixote doflamingo and a yonko. so if there were no other variables he would have gotten someting around 800M, but there are-he will take them down with the help of other people, and it's a lot harder to...
strawhats new bounties
luffy: 575M, because it's been 2 years, the marines saw his power, learned that he is the adopted brother of sabo (second most powerful person in the revolutionaries) and untill the end of the saga he is going to take down donquixote doflamingo and a yonko. so if there were no other variables he would have gotten someting around 800M, but there are-he will take them down with the help of other people, and it's a lot harder to...
strawhats new bounties