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.
You stated an undisputed facts, Bitcoin is the best coin so far and it doesn't look like there will be any rival any time soon, therefore holding a good portion of Bitcoin is a good way of safeguarding our portfolios. Also, I agree with the altcoins in your list apart from BCH and Vchain, not really a fan of them, but either way, keeping good and promising altcoins is another good way of keeping our portfolios solid. In the same way, although there are many IEOs which are not worth the attention and time given to them, only a little percentage makes sense thus due diligence is highly recommended when checking out any IEO.