If a coin is delisted from a particular exchange that doesn’t mean you can’t get it on other exchanges. You can actually use other decentralized exchanges to actually get it. But this idea of buying a dip of Altcoins is something I sometimes see as a very risky move. Although Monero is actually one of the best performing Altcoins out there in fact my favorite altcoin due to its anonymity nature and looking at its potential you will see it is not a dump and pump coin but still it is an altcoin and buying its dip is more of a gamble than an investment strategy. So even if you want to ape in just go for an amount you can afford to lose.