A lot of disabled/neurodivergent writers can't promote their writing in person. Chronic pain might limit outings. Living on SSI/SSD (or equivalent programs) means there are no funds to travel. Crowds could wreak havoc on someone with anxiety.
Luckily, there are plenty of ways to promote our writing (and ourselves) on the Internet. Some are cheaper than others, but the right one can be just what you need.
1. Start a blog or write guest posts on other blogs. (Like this one!) Blog tours to promote a book are a viable option.
2. Vlogging (or streaming) on Youtube, Twitch, or Facebook. You can do readings of your works, talk about the industry, etc.
3. Focus on your Facebook or Twitter. Try Instagram or another platform you may have overlooked.
4. Submit to online literary magazines. If published, you'll have a link to share on all your social media.
5. Start a monthly newsletter.
6. Make a book trailer or a video out of a poem.
7. Offer an online class in an area you have expertise in.
8. Join writer groups online. It will take a while to find the right ones, but it will be worth it if you can find them.
9. Have a traditional author website.
10. Do giveaways (sparingly). Giveaways can be a decent promotional tool, but they can get expensive and not worth it if they don't take off.
11. Make your books available in e-formats.
12. Take interview opportunities.
13. Start a virtual reading series with other writers,
14. If a book club covers your book, schedule a Skype chat to "meet" the members.
15. Schedule a virtual book launch when your book releases.
Always take into consideration how much time, energy, and money you have to put into promotion.
Your writing comes after your care but before marketing efforts.