If you’re an expert in a particular niche and people just bring you work, then being a solo operator works fine.

You choose which engagements to take on based on your own capacity, and you’re not burning cycles on business development etc.

The problem with such advice is that it requires me to go back in time and fix my life. I am not an expert, I started this career when I was barely an adult, and did it for fun because I liked it and the money was good. I wasn't thinking about "building a professional circle" or staying in touch with past colleagues.

So advice like "use your network to find freelance / contracting" is not helpful to me. So there are two options for me: either find a way to make it work now, or accept the fact that I fucked up my life and I just need to wait for the inevitable replacement by AI. I doubt that every successful entrepreneur started to build a professional circle at the age of 21. But I might be wrong.