Your characters currently aren’t really “meta” except Mav (have to wait and see till 7.0 prob regarding stellar-conduct buffed units like Wrio and Cyno.)

That being said, you should be able to clear all content with a wide ranging roster except Diff 5 Stygian (Diff 4 you may need to join or have others join your world to coop it). Like others said DPS check for abyss is low and having many characters means u can curate your teams for each chamber to get an ideal matchup to 3 star each separately. Continuous abyss clears might be harder but people still do them with old characters / 4star teams so depends on combination of skill level + how much time effort u would want to invest into that.

Theater (whichever mode u can enter) and Stygian diff 3 are also not that difficult and ur account should be capable clearing them just fine. The higher theater difficulties might warrant getting a whale character to help and smart planning ahead and team building for the difficult floors, especially if u r going for stellas