In the anglosphere they allow you to make ad hoc capital repayments, on top of your monthly payment. This has the effect of reducing the capital outstanding much quicker. And because interest is only charged on capital outstanding, you end up paying less interest too.

If I were you I'd check with your lender to see if you can make ad hoc capital repayments, and if they allow it, funnel some of your crypto profits into reducing your loan.