At this current time, it is not advisable to invest your money into altcoins. It is clear we are in winter which means some of them will be dead and some of them will be under the blanket(sinking). So if you have 30k$, do it wisely buy doing DCA(Dollar Cost Averaging).
Make a batch of buy at your support point and ONLY invest in Bitcoin because it is the only one that will survive and stay strong despite the winter.
But it is not going to be hurt if you want to try your luck in others, but it can not be more than 10% of your total capital.