How do I handle a long gap on my résumé? after 17 years as an IT help-desk technician

I have been out of work for 3 months and worry about the gap. This is my first time dealing with any of this. I have done some volunteering and a course during that time. Did anyone get past it?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Keep your skills fresh and mention anything recent. It shows momentum.