I know I'm going to get hate for some of these suggestions, but I'm going to put it out there anyway.
Idol - I don't like that Idol is currently just an offhand weapon. The new Major ID will make it even more so a movement weapon. Increase the base damage plus add +50% water dmg for Flying Kick/Tidal Drift). This makes sense especially with another Hero nerf and Battle Monk rebalance in the works.
Az - I get that it's a low level Mythic, but lower the dex minimum and give it more water and fire dmg % so it scales better with player level.
Alkatraz - please just give it 2 powder slots! even if you have to lower the base damage a bit.
Convergence - make the elemental conversions worth it. Lower int/def minimum or change requirements to str/dex. It's the only 1.20.4 mythic that has this issue.
Freedom and all other Rainbow mythics - make rainbow great again. I liked what was done for Singularity, the ability to focus on one element. Do more of that.
Inferno - just give it Super Slow and +1 attack speed so it has a place
Hanafubuki - POWDER SLOT!, even if it's just ONE!