Ex-Commercial HVAC Service Tech here. Messed-up my knees and back years ago, did Tech Support/Training for McQuay/Daikin for a few years, but got really tired of traveling (esp. during Covid), and now I'm like you- sitting at a desk, doing quotes, for a small/medium size mechanical contractor that treats me pretty decently. They say I can work from home, but it's a PITA, so I commute most days.
Hoping to retire on Memorial Day (92 working days to go), but financial advisor just said, "Hold up a second...", so we'll be setting-up another meeting with him in the next few weeks to see what's on his mind.