30k USD is too much to put into one coin. If I were you I would share at least 10% of it to play on small altcoins which are full of risks. But if you really want to invest that much in one kkoin try choosing one of the top ten like XRP or Cardona. I love cardona.
Lol , this is just a peanut for a true investors mate , but if someone is willing to put this into one coin then this will be Bitcoin as this will only be a 1.5 bitcoin all in.
But talking about altcoins? then yes we should always consider having our folio filled with multiple coins and not to put into single currency because there are something to look at specially risk.
A good start if you start a cryptocurrencies investment with $ 30k, the easiest thing is I will share with 2 types, 60% for top coins and 40% investment in new projects, namely buying tops coins like ETH, BNB, Matic and Cardano, then I use For staking, and the rest is 40% I will use for investment around 10 new projects.
good list , just add Bitcoin aside from altcoins is much better.