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