You should invest it in mining, this seems to be a sure-fire profit model if done correctly.
etheruem is not profitable as before, and enw gpu are coming, it's better to wait at the moment, before investing in mining
mining isn't profitbale anymore for the majority of the coins, which basically means that if you buy some hardware to mine with you'll never roi unless you insta mine a new altcoin that will explode in value after some time. as long as that doesn't happen, mining isn't worth the time and money you put in it.
if you have cheap electricity any coin that is not dead it's profitable, you can even have profit at 50k satoshi per gpu with 5 cent electricity, it's all about electricity price
farm are keep adding new gpu each day because they cna afford to mine with cheap electricity