Solved, thanks to @DegenAllinBTC for the method:

1. Go to MCT to merge UTXO, for $BTC of 85U, after merging you will receive around 50U, if it fails, just try a few more times

Link: https://mct.xyz/btc/utxo/merge

2. Go to the UTXO management in OKX wallet to unlock, and you will get $BTC that can be transferred.

Looking at these inscriptions that were once made, full of memories, I really was out of my mind back then, wasting a pile of $BTC. 😂