dump now and Pump tomorrow.
If you do really want a bit of assurance with your portfolio, having bitcoin for me is also a must. When most of these alts are disappearing, btc stays. There will be promising and valuable alts to hold, but yes, that is for you to evaluate and study which one of them are worth holding to. Because let us admit, most of them are launched for the sake of the dev team's pockets. Very few has the sincerity to develop them into something useful for the public consumption. This is why, it is very risky when it comes to alts, you have no idea of the project's longevity in the market as it depends mostly on the team.