Embarrassed myself after shipping my bike to Arizona with fairly level ground for cycling.
Had not used it where it was due to steep grades, tourist drivers in rental cars, and age.
After reassembling (another story) the bike, I found I have gotten too stiff to get my leg over the seat.
Not ready to be that much of a geezer yet.
Get a bike with a dropper post. Dropper posts are marketed as something for crazy young folks who are crashing down mountainsides and bouncing through rock gardens on mountain bikes. Well ... I’m way past that. But they’re great for those of us in the old, creaky department as well.
Try some exercise with the leg for a few weeks and prayers-up for your good result my Friend :)