To unlock the More Power trophy in Mortal Kombat 11, you will need to use 50 Konsumables, which are modifiers and buffs, in the Towers of Time.
You will also unlock the trophy below when you use 1000 Konsumables:
You earn Konsumables in the Towers of Time and from opening Krypt chests. Once you have some, from the Main Menu > Konquer > Towers of Time. Make sure you use Konsumables in every match.
Once you have used 50 Konsumables, the trophy will unlock.