I just do a simple investment strategy, buy cheap coins with lots of numbers, after that hold for a long time. After getting the high price, then sell.
I am also doing this strategy. But sometimes it's hard to predict the future of the project.
How do we know if that project will last long? I think that would be a difficult answer for us.
If you do not want to follow the mentioned strategy, then there are many alternatives for this. This is the long term strategy which is described by you but the good thing about this is that it has guaranteed profits and less risks involved.
But if due to some reasons you cannot follow this strategy, then try to learn trading and its tactics, that is how you can get profits in shorter duration of the time. But let me remind you again, trading has a lot of PROs but it has got CONs as well.