Heist difficulty levels

Can anyone help me with what is the best level for each difficulty levels. What level should a hero be to actually be useful in each difficulty level in heist?
So thats the best level for easy, medium, hard, very hard and super hard.
For me I am able to participate in medium heist without being useless and im at level 90 with mostly O0 heroes.
Any help is appreciated, thanks.

Depends on how strong your hero is

If your level 90 O0 heroes are maxed, you may try the Very Hard heist.

Ok thank you!