my advice:

• save the teams you used for each boss so you have reference next time
• make adjustments where you see you struggled.. certain floors have champs which can be so annoying so prepping for those is key
• if it aint broke dont fix it XD
• keep  going every rotation until your comfortable. Those secret room shards are no joke. I think Normal has better rewards in champs than Hard. Literally all Doom tower champs shards are viable in HArd progression, Archamage ,Rian, Akoth...super cool champs to ascend floors
• keep coming back and attempting failed floors. Manual if you have to. the goal is to beat the stages 

keep going man, its a great experience