The most important thing is that you are healthy.
If you can check that box then the next step is :
Watch this one minute Bryson video... and focus on the 3 moves. (especially # 1 and 3 at first) https://www.instagram.com/reel/DBy6sujxf79/?igsh=MzRlODBiNWFlZA%3D%3D
I have been able to increase my adult kids speed 7-10 mph in half an hour using this method solely. (and now I am cruising at >120 at 58)
I have zero doubt I would have you over 100 in a half hour.