Yes, there are people who do that, including Ari, the Tech Mensch. Some will even help you to shop for what you need.
You need to start from scratch. At a certain point, you won’t be able to update your operating system, then other programs and applications won’t be able to work properly with your old OS. I’m guessing that you’re way past that point now.
There are several people who regularly advertise their tech help services in the Friendship Heights Village newsletter. You may have to go back to pre-Covid issues to see all of them. I took a workshop with Ari, the Tech Mensch through the JCA, and I found him to be knowledgeable, patient, and kind.
http://thetechmensch.com/
https://www.friendshipheightsmd.gov/new/village-news/