Yes, this is the point of an issue now that why the crypto market is going down and down. It feels like another bear market has come and persist for another 3 years. But, guys who are in huge loss requested not to sell in this panic situation because if you sell then this trend will continue until the ground level of price.
In this case, you are very unfortunate. You must invest only the money that you are willing to lose in case of failure. Of course it's easy to talk, but it really is.
If you want to gain a big profits you need to take on how it's risk, invest that you can afford if ever it lost. There's many good altcoins that had great potential that will give you a profits like ethereum, litecoin, Neo, Cardano but you should do a research to be sure that you will get profits.
Yes, buying coins at current prices can bring good profits in the future. The purchase of crypto currencies after such a major decline in the market is similar to going to the store with very large discounts.