[Serious Problem]Which buisness would you choose in this case ?

So,

I need to make some money this year to study in the us, I need at least 50k $, So I've started several business that failed, but I didn't gave up about my dream & now I think that I'm on the right path :

I've built an online tool to find fitness and sporting goods deals, the whole tool is monetized through affiliate links, If I put more efforts on marketing, I could make around 20k to 30k a month, which is very good .

Cons of this method : I won't get paid quickly as this is affiliate marketing, also I can only get paid through checks (since I'm overseas), which may get lost and in the end never get my profits .

The ALT way : It seems that those days, a lot of professionals are selling online courses and are making some really good revenues with it . I thought that I could build a good email list (I know that this will take a while) and then ask them to sign up for my programming course, I will start by getting an audiance before building the course tho .

I could work on both, but I need to focus mainly on one, If you were my place, and you only have 4 - 6 months to collect at least 50k, which one would you choose, and why ?

Thank's

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