Even when the process was enjoyable (as in playing Souls-like games) because your own skill is improving it was very lacklustre compared to my other more recent hobbies (such as music), it gave me a sense of accomplishment that is very narrow, it only applies to that particular game and it isn't a skill that is broadening me as an individual. And then I realised I didn't like this kind of game anymore.
I'm still very much up for playing short games (or games I can play in a burst and let it sit), couch multiplayer/co-op games, etc., games that are an activity while socialising but single-player grind-y games aren't my thing anymore, they are too time consuming for my life nowadays.
What I really enjoy now are smaller indie titles with shorter gameplay and more focus on artwork, like Journey, Little Nightmares, A Way Out, Night in the Woods, Vanishing of Ethan Carter.
The older I get the easier it is to predict the end result of an activity and the easier it is to not start things that won't produce long term fulfilment.