Well, if you put dollars into crypto you are exchanging one fiat currency for another. Of course there are always going to be bubbles in markets. You can take advantage of some bubbles, but more than likely you will lose your investment. On the other hand, if you have a thousand bucks to spare and some time to learn something new, you could buy some options and make small gains at relatively low risks. But you will have to learn how to do this and take in a lot of information to predict market movements.

If you have the hardware already to mine ETH, then by all means. Do it. It is still profitable, despite the last few days seeing the price drop and difficulty increasing. In practice this has halved my income from it, but I do not rely on it. If it loses all its value tomorrow, I will not have lost much. Maybe a few hundred dollars in energy cost.

I would spend my money on making sure you can survive long term. You can not eat dollars nor can you eat gold or silver, bitcoins or ethereum. Learn a new skill. Buy some tools. Store some extra salt. Lighters. Canned food. Small investments that could turn incredibly valuable very quickly.