The Bitcoin halving could be the biggest thing to happen in crypto right now. I've seen how prices started to rise by the beginning of 2020. This could be an indicator that Bitcoin could head towards $10k per coin by May, while other altcoins will become much more valuable than what they are right now. Ethereum will also bring new and exciting things to the crypto space as it fully integrates ZK-SNARKS and switches from PoW to PoS. With all the exciting events that are bound to happen this year, it's believed that demand for popular cryptocurrencies on the market will rise like never before.
Be aware though, that crypto behaves in strange and bizarre ways. Just as 2017 was crypto's brightest year yet, followed with a decline in price, the same could happen after the halving event. Most people are often into the next big thing in crypto, leaving old projects in the dust. After all, they're in it for the money than anything else. Year after year, we'll be seeing new and exciting developments within the crypto space. It's important to always keep watch of the news in order to determine the "hottest trend" of crypto in the moment. As long as the industry continues to develop over time, we'll see new trends that will take the world by storm. Just my opinion