I personally never run out of projects. I retired in 2004 after 32 years of service but have still continued to work part time treating patients till Covid hit. It's a good way to keep up skills and teach others.
Really I wonder how I had the time to do the things I did when working full time.
If you are happy where you are at that's just fine. Maybe you need a zero job. Possibly to decompress or even self punishment in reminiscing the past. It "Max No Difference".
Just also be aware that if you have not filed or actually done complete retirement your lower income can effect your calculated retirement benefit on many programs. For instance many programs average your last 10 years average income to calculate your future return. In some cases a zero job could drastically reduce your future retirement income.
Of course I am sure you already know this...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)