Maybe just create a button that says Max Possible Level for your current ISO? Wouldn’t that make the most sense?
No, because that way you would not look to buy the shiny ISO packages. Just 100$ to level 4* (oh wait, not really to level it to 270, just to level it a bit).
Completely agree, this makes sense and would improve usability. I’m not stupid enough to go anywhere near an ISO purchase button. Bling it all you want devs, you won’t get a bite from me.