Jeez - that is a really rough run over the last decade for you!

I won't give advice on what you should do - only you can figure that out, but if I was in the same situation, personally, I'd stick to indoors for higher mileage training and limit my outdoor rides to fun rides around safe settings (parks etc). If the funds are available, invest in a setup to make indoors interesting and comfortable. For example, if possible, have the bike and trainer set up in a well lit room vs a dark basement, make sure that airflow is heavy with a proper fan (this makes a huge difference on any indoor ride over 30 min), invest in a good rocker board so that your body is not sitting static all the time (I use a KOM rocker board that has side to side and fore-aft movement), and if you have the funds, run Zwift/Rouvey/etc on a decent computer system with a large screen TV for a more immersive experience vs a phone or iPad.
To keep things interesting/add diversity, I'd also blend in other activities like swimming or rowing. Finally, I'd think about a bit more strength training once capable. As we age, there's an increasing propensity for breaking bones, and that can be worsened by only focussing only non-weight-bearing activities like cycling. We need weight bearing activities to strengthen bones and connective tissue and to prevent age-related sarcopenia.

Best wishes for a speedy recovery!