€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.
There's more than meets the eyes when it comes to trading, especially with futures. I understand a lot of newcomers want to jump in with futures for the hope of multiple profits, but if you are not well-versed on what you are doing, you can easily get liquidated. Better start with spot trading and see if trading is really for you. Spot trading alone is already tedious as you need to observe and study the market you are going into. It is not a rocket science, but diligence is needed in this market. You can't face the battle without any knowledge here.
Those that are thinking that they can make a lot of money with futures, no one is going to stop them.
But they need to be reminded that only experienced traders are the ones that earns from it. Compared to the typical setup of investors turned to a trader, they only sell when they're in profit and in spot, it's easier than with leverage.