Depending on whether you have more cash to invest, some traders might create a hedge or double-down on the original investment. Basically, both of these ideas require putting more cash (and risk) into the market, with the hopes that the second investment brings you back to even, or hopefully better.
The double-down idea, means buying more of the now much discounted cryptos. You could buy the same coins, or others that may have a greater possibility of a comeback. Personally I consider this to be quite risky at the moment, and more or less - not advisable. However, I do know people who are doing this very thing. They believe in these cryptos, and are convinced they will bounce back. I wish them all the best of luck...
A hedge, is doing something very different or even opposite of the original investment. I know of a few crypto traders that are also investing in the so-called crypto rigs (the computers that generate new coins). That could be a bit pricey, but might pay out over time - as long as you can afford the electric bill. I even know of one person who gone into business selling computer graphics cards (the most important part of a crypto rig) - besides building his own rig. Another hedge idea is to look at something that has been beat up pretty hard recently, and may stage a comeback. This might be things like precious metals, or electronic instruments representing PMs. If the original $1000 represented most of what you had to invest, then hedging may not be an option.
The most simple thing to do is taking El Goretto's advice and hold on for some extended period. Just be patient, and save as much as you can during this time. At some point, another opportunity may arise and you can take advantage of that. Just remember the old saying: "luck is where preparation meets opportunity".