Minisite Education
Mini websites can be built gradually as there is time and energy to work on them. Websites are nice because you can start with a few poorly written pages and edit, improve and add to them over time. The search engines see the ongoing changes as signs the site is being worked on and reward you with better rankings.
If you have trouble typing, voice recognition software has gotten much better over the years and would let you produce extensive content just by speaking.
Unlike a job, where you are expected to be productive all day, every day, a mini site can be built over a period of months or years as there is time and energy to work on it. In fact, if you have lots of time on your hands, one of the major frustrations is how slowly your work is recognized by the search engines and rewarded with better rankings.
The content for your website(s) can be anything which you find interesting and worth learning about. You may read articles which promote the use of high paying keywords on various subjects but I don't think you will keep after it if you don't enjoy the subject you are writing about. Of course, one of the advantages of a mini site is you may only spend a week or two writing it, and probably won't get bored with it in that time.