In my opinion, the best stage for buying tokens is their listing on crypto exchanges. As a rule, first the tokens are listed on poorly liquid decentralized crypto exchanges, where their price falls tenfold. The best solution, in my opinion, is to buy them at this moment. Then, the tokens go to the larger exchanges, the volumes of their trading begin to grow and the price of the tokens increases accordingly.
This is a simple and important, working strategy, but you can not use it on all projects, you need to choose only those that really are of some value and are able to get involved after a weak start