I chose to move in with my elderly parents and care for them as they get older. My dad is already handicapped from stenosis surgery and needs constant care. I have a furry friend who lives here too, and usually have always had one in my life at whatever interval.

Point being, if you recognize you want a life of solitude in a personal sense, it does not mean you have to literally isolate yourself from all others. Solitude is a state of mind, not a literal thing. Internally, you are confident that you don't need or want anyone but yourself.

I do recommend pets though, whether alive or digital or whatever. Something that obligates you to care is a good thing to help repel incessant depression.