Hello guys, having been here for a while now, I feel that having a higher percentage of your portfolio on bitcoin and maybe the rest 30 or 35% on already good and established altcoins like ETH, BCH, Stellar, brave. BNB, Vchain, etc, is a good way of staying away from useless projects. I have come to an understanding that running after new promising projects always leave you heartbroken in 97times, and running after IEO to quickly make up for past losses lead to more havoc on your fund. So stick to the safe zone.
If you wanted to stay away from bad projects then I will highly recommend to make some research first about it, review all the things with regard with the project and by that you can now somehow classify what are the good to invest and what are not. Or you could just invest in top ranked coins just like what you have mentioned just to guaranteed.