I also suggest to invest in Bitcoin first as if the market will go to high then first of all the price of Bitcoin will go high after that the price of other coins will follow. I often do that I invest in Bitcoin and when the remaining coins start to increase then I put my money to there.
At the time when the Bitcoin price increase starts, the prices of all other altcoins will grow much faster, as can be seen from the change in the price of altcoins when Bitcoin grows. It may be worth choosing a few promising altcoins for investing in order to get the maximum profit, for example TRON, Stellar, EOS.
in any case, among the already mentioned cans, I would add such a coin as cardano, which Blockchain likes the platform, which is built on the basis of an open source code and uses smart contracts. Its creation involved a team that relied on numerous studies and a scientific approach to development.