Whatever you do start your own side business. That is the most important advice in life. If you have a side business even you loose your job you can still make money and develop your business into a full-time job. If you work a full-time job then it gives ou extra income and safety.
There is nothing more important than having a side business!
If you work full time, then you have your own extra business very hard. Therefore, you need to look for a passive source of income. But the problem is that you need to have an initial capital for this
The initial capital is not a problem, but if it's your last money you do not want them to risk it. I think that the person before you invest money in a project must be an expert in this field and the risk of investment should be minimal. Become an expert in another area if you have full employment very difficult.