I don't have any knowledge of mining so I will not take a risk of investing money in mining and instead I will buy bitcoins and hold as $50k is huge amount which may be doubled in quick time depending on the price of bitcoins.
HODL is good, but I would spread the $50.000 into Bitcoin, Ethereum, Litecoin and invest in a price-stable coin like Tether or CORION and maybe mine some profitable coin. Spreading is always saver and the top market volume coins are more save then some high fluctuating coins.