Hi, !
My teenage son is BIG into riding right now and belongs to a couple of bike clubs. I posed your question (as a hypothetical question, to safeguard your privacy) to them and they highly recommended switching to from manual shifters to electric shifters. It might be a little pricey, but many bike shops can make the switch for you. They showed me how easy they are to switch gears and it may be something to consider, if you have the funds. It's still cheaper than buying a whole new bike. They also suggested electric assist bikes, which, frankly, are a fabulous option for people who still want to ride freely, but may need to have that back up option, just in case. There's a gentleman in my son's mountain bike club that is pushing 80 years old and rides with his electric bike. Those bikes are definitely an investment, but it can be worth it if you love riding. And Daniel's suggestion is a great one, too, and probably the cheapest option.
I hope you're able to keep riding!
Best, Erin, RheumatoidArthritis.net Team Member.