Hello. I see different platform like nexo, blockifi, etc... that can borrow you crypto or stablecoin. I'm here to ask if you have a strategy for example you borrow btc with an interest rate of 6% and then you use it on defi with 8% APR. Thanks for helpful. 
Borrowing to invest in crypto is worst thing that you can do. You can get hacked and lose everything. But you will still have debt to repay. A lot things can happen then just coin price goes up or down. It is way to risky, please stay out of it.