1. Blackbeard will join Im-Sama
2. Shirahoshi & Hancock will be captured & taken to Mary Geoise
3. Vivi, Bonney, Kuma are already there
4. Marine HQ is right there & Revos are attacking
So all that's left is after Wano Arc, Luffy will make an Alliance with Shanks to take down both Im & Blackbeard.
Luffy's next destination after Wano will be Lodester Island (Short Arc) & then they will decide to attack Mary Geoise because Final Road Poneglyph is there
Luffy & half Crew will go to Elbaf to bring Giants convinced by Usopp, Franky will build Pluton, Zoro will call Samurai for one more Battle, Sanji will make peace with his Family & ask them for help, Jinbe will bring Fishmen & Luffy will call his Grand Fleet
The End will be:
Luffy's Entire Alliances + Red-Hair Pirates + Revos Army Vs World Government + Marine HQ + Blackbeard Pirates
And all Side Characters will be present there