Well, its always advisable to never invest all your saving in any market. You some keep some of your money or at least invest them in some very liquid assets so that you can meet some emergency situations. That is why it is said to diversify your assets and this must also be done on the basis of liquidity. Now you can do is sell your crypto is your investments are in profits but if you dont want to lose future profits then you may take loan from you relatives, friends or banks
You should consider the potential loss of profit versus the cost of the loan. In some countries a loan could cost you up to 30%. If the paper loss is 10%, then cash out and take care of that emergency. But if the loan is only 4%, then it wouldn't be a bad choice.
This is why it's always better to diversify as you said. Something will be profitable so it can be cashed out at a time like this. It's like a product rotation: something goes in, another thing comes out. There's always something fresh on the table.