I took the first two projects on Upwork while working full time, afterwards I managed to land my first long term project before my notice period and then I had

I took the first two projects on Upwork while working full time, afterwards I managed to land my first long term project before my notice period and then I had a constant stream of projects. Humanoid robots sound super difficult. I don't know how many companies might be working on humanoids so I'd advise you to try to look for something relatively broad. For example mobile robots and drones have been working quite well for me, but hardware wise I'd expect them to be much simpler than humanoids.