It is very important to evaluate the future potential of the coin for successful investment.
To do this it is necessary to carefully monitor new projects and check them.
To do this there are special funds like this
https://twitter.com/dao_kronos/status/1506198003060719621 that invest money in new and prospective projects.
Usually when cryptocurrency market rise many altcoins rise too.
But it is necessary to create a project that is really necessary for people and continue to develop such project.
For investment it is necessary to find project that it will be useful for people.
It is necessary to offer the tools that are useful for people and in demand.
Also it is important to support community of the project.