I felt in a similar way despite feeling valuated at work, with good salary and working no more than the time I was paid for. I am now feeling better and the thing for me was: 1) changing job to get out of comfort zone 2) realized I had burnt my main hobby after more than 10 years (coding/computers) so I had to start from scratch looking for other things to do on my free time.

Current hobbies: bonsai trees (joined a local club), going to the gym, getting back to indoor climbing... The more social and physical the better for me (I thought for a long time I was more a lonely person than social but apparently that's not completely true).