Your opinion on what's next

I have been in youtube and ppd for a couple months now and made a few thousand dollars from it. But the earnings have decreased since september and the flagging and bans are getting annoying. So I am looking for a long term method to earn.( around 2-4 months max to start seeing earnings regardless if they are low or not).

Some of the methods that seem interesting involve a lot of SEO. Which I am willing to learn. So I have noticed:

Clickbank
Amazon Associates
whitehat niche CPA (blackhat seo)

I have about $150 to invest (spent most of my ppd money on bills, rent, etc.) I still make about $50 a week from youtube and will be investing all of it into IM untill it runs dry.

I am looking for a method that doesn't require a big investment initially (besides time) once I make a little I can reinvest that. What do you guys recommend?

You might have to select ClickBank. Earnings will be less in the earlier phase and they will be skyrocketing once the dust settles down.

clickbank works with youtube so thats a plus