Unfortunately the Health app on my phone can give me the distance I’ve walked every day going back to 2014, but it’s unable to really give an accurate total for weeks, months and years, only averages, but I walk roughly 1200 miles a year.

Walking is the very simplest pleasure and it became a luxury that I can’t afford to lose again now I’ve gotten it back!

Absolutely, and congratulations and very well done for having managed to get so far! You make my complaints about my arthritic left knee look pretty feeble, but it has affected how far I can walk now, compared to how far I could walk ten-fifteen years ago, and just being able to get out on my own into the countryside and woods for a few hours makes a huge difference.
Good luck for the future!