But aside from ADA there are also others which are obviously growing also. You already mentioned Etherem (ETH). I also noticed that Avalanche (AVAX) is also rising high this week.
I won't recommend any specific altcoin or defi token. Just be safe and prefer the top ones.
I agree Cardano's performance was outstanding, I'm very happy to be holding Cardano until now. I believe Cardano can still go higher, so I won't be selling the Cardano I have any time soon.
I hope your decision about this will prove to be right in the end. What I am saying is that Cardano's (ADA) price has already more than doubled within this month alone. And this is because the project's Alonzo hard fork appears to be successful enough. But it is not without hype of the upgrade. Of course it could still rise but it could also be up for an impending correction. I'm not giving you any kind of advice. I'm saying I personally always handle altcoins with care and caution.