Apple Watch Series 7 Charging issues

Hi!

for the last week or so I have been having trouble charging my watch. I’m using the cable that came with the watch and it’s charging 5% in about 30 min. I bought a new charging cable from apple (not from a third party) which I received today and that didn’t work either. I also have already rebooted the watch, cleaned it and so on. Any ideas on how to fix this? It’s so frustrating!!!