$30k is not a small amount, you can get more than 1BTC.
Investing in BTC will never make you lost moroever if you are investing for long term investment. If I were you, I will buy 1BTC. And let the least to buy altcoins. 50% of the least for Ethereum, and others for BNB and SOL. I love those altcoins because I think that they are very potential compared to any other cryptocurrencies. But, this is only an opinion, it is better for you to think more and cosnider what best and most suitable for you, related to your investment target.