Crypto market always runs on trends and news if the trends/news are positive market will show uptrend movement and when the trends/news are negative than market will show downtrend movement. If you check 3months data of total market capitalization on coinmarketcap, you can easily observe market cap raised from $210 to $250B with few days with positive Chinese news https://en.cryptonomist.ch/2019/10/25/china-blockchain-development/.
So it's always better to look for opportunities like positive news such big announcement from government, testnet, mainnet, block chain upgradation, partnership announcement etc and take advantage accordingly. Its better to look after top 200 coins listed on CMC which will give more options to research and act accordingly.