thru-the-door ice makers have the highest failure rate on refrigerators.
Could be a frozen water line which feeds the ice maker. Depending on location, kinda hard to defrost. Could be a bad valve, a $15 part.. (My GE has separate valves for the cold water line and for the ice maker.). At the other extreme, could need a completely new ice maker. Look up your year, make and model for the parts price of a new ice maker to get an idea. Add in ~$200 labor, and you can decide whether that repair is worth it.
I’m somewhat handy, so enjoy tinkering. Some units are easy for DIY, essentially plug-and-play, but other manufacturers I won’t touch.