How to advertise a my blog with $500 budget?

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Hi! Recently I lost my job, and while searching for a new job I am working on my blog.
Looks like people like it, since my lists were on front page of imgur multiple times (I post them and I always state they are from my blog). I tried FB ads with $20 budget, I received like 12+ like on one of my post for $4, so it is not that bad. From the $20 there were around 150 visits to my site and 10 likes on my FB page.

I paid my rent, now I have around $500 and I would like to see stable userbase, but I have no idea how to achieve it (maybe I need higher budget?)

On my blog I try to post interesting lists or articles and not Buzzfeed like (18 Stuff, You Can't Believe #17 etc.) posts, mostly interesting facts, useful websites and some informative articles (ok and some funny cat GIFs).

Do you ave any recommendation where to buy advertisements for that money?

Thank you very much in advance! :)

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