Buying alts by using ETH pair is a quite good decision of such problems.
It's a good advise, but I ETH isn't so large amount for investment. Best to keep it focused on a few really good ones (that way if they do moon you'll make good profit). Otherwise you stretch yourself thin and don't really ride any of them.
Its good decision if we made good buying for good altcoin such as sether which has low supply in the market.
Buying ada also good decision since from last one week its going very crazy and ups more than 100%. So give more than 1 etherium also good.