5,644
BTC? Is this for real? If so, my goodness! What is this huge amount of Bitcoin doing there in the first place? It is an exchange and, apparently, your funds are not even traded. You just let it sleep there?
I remembered during the good old Bitcoin days that Liqui was one of the trusted exchanges but still they succumbed to the worst Bitcoin or crypto days. Have you, therefore, not received their email informing you that the exchange is closing?
I doubt if they're still monitoring their email but who knows. You may try reaching out to them via
hi@liqui.io. Their official account on this forum was last active less than a year ago although its last post was made in 2017. Who knows, somebody might still be opening it in the near future and be able to help you. Try reaching out to it as well,
https://bitcointalk.org/index.php?action=profile;u=842080. Use all available contact points. That's a large treasure which is at stake here.