Hello, can anyone help me... I have mined a little STL from the beginning, and stop for a while.
Today I check my wallet and I don't see any STL anymore... There are no transactions from the last time I mined
What can I do now

...
Come to the discord i guess?

but good we already helped you out there with below solution:
Question:
My wallet show's 0 balance even though the daemon is synced.
Answer:
You need to restore your wallet via the seed that was given when the wallet was created.
To do so, create a .bat file and place following commands in it:
for Linux: ./stellite-wallet-cli --restore-deterministic-wallet
for Windows: stellite-wallet-cli.exe --restore-deterministic-wallet
save and start the .bat file. It will ask you to name your restored wallet, set a new password and type in the seed. When launching simple wallet afterwards, it will receive blocks and your balance will be shown.