Any idea?

I think 700$ is not enough to make a solid return. I would suggest you to learn more and more. Read this forum and discover what attracts you the most. and try to invest small money and find way to scale.
Again. 700$ is a very small amount. so my advice to you is to learn a lot, and use it to study without expecting to earn any profit.
Hope this helps
How much is enough in your opinion ?
 
I cannot think of a great idea right now, but you should look around the forum, maybe something sparks your interest. However, do try to think about it thoroughly before spending money on something that might not pay off in the future. That might seem a bit vague and obvious, but people sometimes jump into things without considering all the facts.
 
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