No harm in tried and true powers. It may be common, but necromancy is still cool.
Coming up with new powers is tough, but exploring less popular myths or avenues of worldbuilding is a good place to start. Sewing is not common, for instance. Only a couple of writers have done anything with it, so it wouldn't be hard to come up with something new. Lots of mythology to draw inspiration from, too.
Alternatively, "dig deeper" into pre-existing types of magic. Water magic is popular. Milk magic, less so. Arguably just a 'subgenre' of water magic, but you could make it your own.
Well, there is also a different question. What if your character has certain power some other popular character has as his trademark power? Would people accuse you of copying it?