After reading the initial responses it seems that we have an answer:
So, basically yes to the entire list. They are all the best ways to make money.
Which one can you do? Willing to do? Able to do?
That might be a better thought.
However, personally I like the idea of reselling something AND making something yourself.
So, resell SMM or something easy, and doing PBN guest posts yourself.
That way you have a constant money stream and a workload that you manage. One is based on a small profit with large sales numbers, and the other is based on a large profit but fewer sales numbers.