They haven’t even reached their prime. Imagine 30 year old straw hat crew
word, The sh crew are strong as shyt, as a crew right now. they can beat alot of the groups posted in here
and they still got ways to go, theres a number of powerups that lay in front of them - awakening, new haki, new swords and souls to harness and tame(Zoro), will of d possibly(Luffy), new items, new weapons, etc
and whatever other abilities they will learn that Oda has up his sleeve. Def some powers he prolly has in mind that no one thought off the SHs getting to. So the possibilties are endless especially in the One piece universe. Where anything is possible
so they will definitely get stronger. Espescially Luffy who will be surpassing everyone and obviously needs to be the strongest.