Just keep buying during the dip price and don't panic every time you see a big drop, its part of the market trend and in cryptocurrency everything is risky. If you sell already at a big loss, that's fine because you can't revert it anymore and all you have to do is to learn from that experience. Go for the top choice always and if you are still holding with Bitcoin much better, good coins always have a lower risk in long term, you just need to know when to buy those good coins.