First of all people who invested in crypto lately are in the same situation with you. Therefore you need to stay calm. Recovery is a long process but its already started as you can see. Even in the worst case your portfolio will be in a good status when the summer begins.
Why it is because of the season can all depend on? Why does not winter give you the kind of profits that the summer period can give you, what are you waiting for? What is the reason for this?
I f you want to sell just sell, there is no problem with that, just make sure that you don´t loose too much and are able to recover later on the year. It is a long distance run.