I understand what you want but it is very difficult as you are looking for some kind of secret information that can easily help you to do this and this does not exist, the only way to recognize if a coin is any good or not it is to know about the technology behind cryptocurrencies in a profound way, if you do not know this then you are just gambling with your money if you invest in those altcoins, so unfortunately I do not think you have what is necessary to achieve the results that you want to get.
there's no shortcut on how to distinguish high potential projects. if you want to get out of the top alts, and check out the new ones. you really have to dedicate your time assessing them and digging their background. it is not an easy task as you need to apply all your learnings in crypto to identify the potential valuable projects. and if someone is suggesting you with a specific project, don't just follow blindly as he may just be endorsing it because he has vested interest on the project.
so yeah, signals in crypto is not to be trusted as most of them will just lure you to spend your funds and lose it in the process. you need to be smart when choosing a project to invest with.
This is what people like the OP simply do not see, they see the end result which is that someone selects the right coin and make a lot of money and they want the same for themselves, but they do not see what goes behind those amazing results, the ones that can actually do this with some kind of consistency probably read hundreds of white papers and do what they can to see if the developers are legitimate and take every single factor into account before investing in a coin, this means they most likely invest months of their time before they invest in a single coin and people conveniently decide to not see this as it is too much effort for them.