Apple Logo Stuck On Unresponsive Apple Watch

My Apple Watch was working just fine up until a few weeks ago- I was charging it overnight and when I went to put it on the next day it was stuck on the apple logo, so I checked the watch app and it wasn’t connecting. Every now and then the screen will turn black then back to the logo, and for the first few days it would flash the screen it shows when it’s dead or on low battery, even though it had been charging for days. I tried holding down on the crown for 30 seconds repeatedly but nothing. Any help?