€100 for now is pretty good. I think it's better to just trade the spot or invest everything without trading and wait for the value of your asset to rise and then you sell it again. If you play Futures Now, chances are that you lose a lot because the situation is very easy to change.
I think your last point is the best to do and the results will be maximum if you can last up to 3 months if you can't afford 1 year.
If he assumes to be a trader, he can invest into those newly listed coins while liquidity is still quite high. He can check them out and see what will happen in a week.
He has to make sure that he gets to profit 5%-10% and get out of once he's done and repeat the process. Sounds easy but it's not actually is.