Eiichiro Oda, the creator of One Piece, in the new SBS Vol. 97, which has been translated by Rainbow - TCB Scans + Etenboby WG Forum on Reddit, has announced that One Piece manga is heading to its greatest war after the current Wano arc is over.
Oda, earlier revealed that One Piece will be ending in 5 years. But he has clarified now that what he actually meant was, the "juiciest part of Luffy's adventure" will be over in 5 years as that is when the mystery behind the One Piece treasure will be revealed.
Currently, the manga is in the Wano Arc and the battle has intensified as the war has begun between Straw Hat Pirates, The Wano Samurais and some members of the Worst Generation against The Yonko, Kaido and his Beast Pirates with an alliance with the other Yonko, Big Mom.
You can check the full English translation of the SBS Vol.97 on the link below.