Look at the peak and dips in the Cryptos with the largest market capitalisation. And make a decision when to enter. Inform your self about perceived values of each crypto on the market.
I bought BTC at price parity with gold, as the Fear Of Missing Out (FOMO) for me was I would not be able to afford a BTC at the end of the year, which is now true.

Worth having some exposure to BTC as there will be a fork. Buy a coldstorage hardware wallet to store crypto!

Trading to maintain/increase crypto value... I have had limited success and some failures. But a small trading pot is good to learn with.