Completely agree with everything thus far. If I really needed to get myself moving and had no motivation then I’d plan a walk to somewhere I could enjoy a nice tasty meal, a bit of shopping then walk back. You’ll know best what distance you can manage but if I’m not sure how I’m feeling then I’ll plan a route with bus stops just in case.
When I lost my get up & go it was because I was ill so if this feeling lasts, get a GP appt.