Everglow is doing God's work putting together the story of KH in chronological order. Although the mobile game is still ongoing, he's spending the first 10 episodes telling the story of The Foretellers, Keyblade War, and the new Union leaders before moving on to BBS.
This could easily be a couple hundred videos before he's done, but if you want a comprehensive deep dive leading up to KH3 this is it!
Speaking of mobile, it's introducing some sort of PvP mode soon that should be interesting. Still unclear if the Global plot will ever catch up to Japan, still about 6 months behind atm