I didn't work for 3.5 years. Lived off of savings. Wasn't looking for work either. Thinking about applying to jobs soon (I used to be an Engineer -automotive). What should I put on my resume for the 3.5year gap? Furlough? Family leave? Medical leave? Not sure if I'll get an interview but let's see.
Don't make up false employment.
Have a specific reason that has a specific timeline.
Like you always wanted to take time off to go to Europe or to take a one year sabbatical to organize your life, home or learn a new sport, hobby or something positive. Then COVID hit and you were prudent and responsible enough to have saved money to not risk working.
Might be a good idea to look into some courses on some new or current practices in whatever field you have the luxury of choosing to get into. Maybe a refresher or updating on the latest CAD platforms?
Maybe look into investing some time in the Gig-based side of the industry to get some current references of your good work.