Google and Youtube have been my best friends several times over the life of my last refrigerator (especially the icemaker). Sometimes it was something as simple as a line being frozen up (maybe aim a hair dryer in the right direction if the internet can tell you where that in in your model). Sometimes as mentioned above, taking it out and letting everything defrost for a day or so would fix it for a while. (My model was extremely easy to remove & replace - one screw and a couple of “plug and play” wiring harnesses.)
Just be cautious when searching on the internet that you’re getting a reliable source, and not one that’s going to ask you for a credit card! One I found helpful was https://forum.partsdr.com/.
Eventually when all else failed I was able to get a replacement pretty easily. It might have been over $100 but not much over . Of course that will vary for different refrigerators. If you get good DIY info from a website/forum and they offer to sell you the replacement, you may want to check Amazon for the price. I don’t mind letting a helpful forum make a little profit but sometimes there was a big difference.
Also, during the downtimes, I had ice trays that made cubes the same size as the icemaker, so while they still had to be filled & emptied manually, I could dump them into the icemaker bin so they still dispensed through the door.