Borrowing or taking a loan and investing that loan in crypto isn't a really wise choice cause as you said the market is extremely volatile no one can really tell what's going to happen next, just because you see bitcoin is bullish doesn't mean it's going to be bullish forever, let's talk the people who fomo'd and bought bitcoin at the ATH in 2017 bull run, they had to wait 3yrs for the price of bitcoin to come back to that amount, debtor for 3yrs?,lol,nevertheless it's not wise to borrow to invest in crypto.