The interesting point to discuss is to predict if bitcoin will remain the king or not. As of now, all alt-coins follow what BTC does. Right now, Bitcoin has a 42% of dominance on the crypto, but it has been decreasing since 2017 with new and better cryptocurrencies. Depending on your risk appetite, it can be a good opportunity right now to invest in projects that you believe will succeed from others (The new Amazon, Google , etc.) or if you want to play safe, invest in the whole crypto-market by putting money on the always Top 10 coins.
From my experience on my cryptocurrency journey: HOLDING is the best option on good projects. Invest on the useful technology, not on the quick buck. You have to see the big picture: imagine yourself in 10 or whatever years it takes for Blockchain to be an everyday used technology, widely known by everybody. Similar to what happened to Internet.