which tower? if you mean echoing or resonant I think you can just build xiangli yao or mc with any support to clear it, if you mean hazard you have to change party cause heron have high havoc damage resistant.
Try to build character to the max. (character level and talent). Upgrade everything including the sub dps. I used to thought that im not gonna full star the tower before but after i upgrade everything i realised that its kinda doable, despite how bad i play the game lol. I probably not gonna full star every new toa update but at least im sure that i can get at least 27 star