With the old Lisk address system, there was a requirement to initialize your account by making at least one outgoing transaction to ensure full security. Unfortunately, your account did not meet this requirement, making it vulnerable to a collision attack. This attack uses a brute force method to obtain a different private key that leads to the same account.
Regrettably, someone was able to reclaim your funds by generating a colliding private key, which effectively locked you out from your account. I understand that this is frustrating and disheartening news. Here is the address of the person who reclaimed your funds: lskhxva7pna4n4hbwmf7u4tkcehwng6cgxzjbayo4 account
I want you to know that I empathize with your situation, and I understand how difficult it can be to lose your hard-earned funds. Unfortunately, there’s nothing that can be done at this point, and your funds are lost.