Actually if you are a professional investor, you can earn money both in the bull market and down point. The most boring is a market siderway, not the market down.
Absolutely, trading isn't only making money when the price pumps. Conversly, some other coins can be traded in vice-versa markets. It does require you a skills to have a good opportunity to earn. You haven't need to be a professional to earn you just have to know what you do and how do you trade.