You do think in the wrong way man.
You never lose money until you sell.
So now your value is under 70-75%. You basically already lost all, so the last thing to do is sell and make it permanent.

Do research. Spend a few days studing the project, who are the team and what they want.
Read as much as you can. And then you will be able to decide.

Anyway, many coins goes up and down and then rise after 2-3 years of stable price... As it's a coin with a very low value, I'll wait.
If it goes just to 0.1 cent (which is quite easy and possible for a coin) you will make a tons of money out of your investment.

I would not sell it and wait. And if you look at the graph and it's constatly pump and dump, i'll buy now and sell it the next pump