Help spending ingots?

Good evening. I am a day 1 player..yada yada yada...and I have 4 Damascus ingots. I have absolutely no idea how to spend these properly. I can beat both high trials without a MUB 5* ele, so why should I use it there? The new raid types are said to be harder than master IO but easier than high trials, so again I am lost.

Someone once spoke of using them all to MUB a 5* then dismantle it, I am not sure if that’s cost effective or not.

Please help!