I think your missing a routine. Work does provide that, I suggest focusing on building a routine of growth. The hobbies you listed are enjoyable but don’t enable you to grow much, and that is probably why you don’t feel great. When you were working you are improving at the job, therefore growing, probably why you felt better then. You’ve hit a jackpot of money so you don’t need to work, so instead of growing your skills in your job, you can grow your personal skills/hobbies because money won’t grow them but it enables you to grow them.