Isn't one of the ways check Coinmarketcap and then check which went up the most the last week or day? Of course if you do that... well many coins probably already hit the peak or close to it?
If you do it that way most of the time you gonna just find a coin that's already past its bullrun phase, but even if you found one that's still on the way to its peak you gonna be really hesitant since it's already going up and it might go down anytime. The best way to discover coin that's gonna get bullrun is the news regarding the projects.