IF you have a relative that you trust enough to be an executor of your will, that's probably the best. Problem is relatives who distrust each other and want to get their share. Lucky if you have family with other needy members like yourself, who will "take you in" in some fashion. I recently had to deny a so-called nephew who tried to identified as such, because I remember too well his parents shiftiness. Had no memory of him. See this acted out on TV series about "Hoarders."
An attorney can probably write you up some legal documents that specify how assets can be used, probably requiring who your trust director is.
Must be lots of organizations, church and other, who are able to advise on your predicament. When I search for such on internet, I find: some that are providing basic care for the needy, and some that are costly. Maybe good to approach AARP and local social services for free advice about assisted living, etc..
I would be considering getting either full-time live-in aide or part-time assistance at first. Where I live, which is in a government-assisted apartment complex, paying only 30% of income, we have a Social Services Director who coordinates our needs and available services. Through her, we can arrange for regular help, but not live-in arrangements.