You may get it back in the future, if they open again… or not. Sorry for your loss
It is reasonably well-known that it is dangerous to leave money on exchanges. BTC is only yours when it's in a wallet with a private key that is known to you, and no third party.
I've lost more in my own local wallets due to losing both of the USB flash drives that contained the keys (as ridiculous as it sounds, I think my girlfriend's cat stole one of them).
Realistically, I've come to think cryptocurrency just isn't for me; it's too damned easy to lose. I also forgot my passphrase for some other BTC (I think I remember it, but it doesn't work, so, there those went). It's not huge sums; 1 BTC here (which was only worth about $300 when I "lost" it), a half BTC there, but the only BTC I still have access to is the half of one I have at Coinbase.
I may yet find one of those flash drives, or figure out what my passphrase actually is for the others. But, what I have found for sure is that BTC is too hard to keep safe (mostly from myself).
> Realistically, I've come to think cryptocurrency just isn't for me; it's too damned easy to lose.
I think this is one of the reasons that Bitcoin has never taken off in any real-world sense. (Yes, criminals and speculators love it. But aside from that, its use is trivial.) The math is very cool, but the anthropology was incredibly weak.
People who build real consumer products spend a lot of time studying users and solving small problems for them. As you see even in this thread, early adopters always deride the dumbness, weakness, and laziness of mainstream users. But derision doesn't cause adoption. Indeed, it often blocks the humility and hard work needed to make something competitive in the real world.
I've got 1 btc there that I convertes to Etherium just hours before they went down. Was waiting for my wallet to sync before transferring out. So even a few hours in an exchange is dangerous. Used btc for years so trusted them but got unlucky.
It is reasonably well-known that it is dangerous to leave money on exchanges. BTC is only yours when it's in a wallet with a private key that is known to you, and no third party.