This might be some form of "normal"? I know it happens to me too. I don't have your solution ... just validating your feeling. There's certainly more resources for learning/practicing out there than ever ... but sometimes everything just seems old and unsatisfying ("stale"). I think my best pill would be finding some other people to play WITH. Easier said than done.

I have a history of dealing with the stales by letting the guitar drop waaay down the list and focusing on other interests- sometimes for very long periods - until I genuinely miss playing and what used to feel stale is fresh again. I started playing 40 years ago but my accumulated playing would probably amount to less than 25 years. (not a good strategy if becoming a really good player is a high priority goal for you)

Push on brother, just wanted to let you know you're not alone. :)