I would invest in something like trading or gambling just for the fun its not that its necessarily to invest it into something good right ?
It was not asked if it should be something right, but it was obvious that the guy needs an idea on where to invest it and that means the OP needs some idea on how to earn more from his regular $40 earning each day. With that, I am sure that OP needs something that earns, so your first suggestion is good but the second which is gambling, that's off!
I don't know there are people that are suggesting some investments just for fun. It would be fine if the money that will be invested is just going to be for fun too. Gambling for fun will surely ripped off your pants easily and that $40 will not even be enough if you drag yourself into addiction with it, trading would be better.
dividing the 280 per week into 28 ten dollar increments and buying low valued coins with each ten dollar set would end a month with an investment in 128 alt coins per month. if these were bought at 1 sat each and even 1 per month goes crazy and sells at 10,000 sat, or even 1,000, then that would be a nice little investment. there is actually work in this though, buying 30 coins per week is pretty easy, but checking the list will get harder and harder as the list grows and grows, for that reason i would keep all the work on one exchange and that way a simple login and peek at the wallet screen would show those that have the highest estimated btc value