Or, can you share the picture?, because when I tried to search on the internet, I find that sometimes the Monero balance will get locked, you have just sent a few Monero to unlock it. Or if you have the 13, 14, or 25 mnemonic seed, you can restore it to another wallet like Monero GUI wallet, Ledger, or Trezor. I've never used MyMonero.com wallet, but usually, you can find that mnemonic seed on setting.
Source: https://coinguides.org/monero-balance-locked-unlocked/