I got my ETH drained from Metamask

I am shook, not sure if this is really happening.

Today, after opening Metamask after a couple months, I noticed something unusual: My hardly earned ETH bag was gone.

After years of devoted mining and little to no trading, all my Ethereum got drained. I moved my crypto away from CEXs in March thinking it would be safer here, yet here we are today.

I’m not very practical with on chain analysis, yet I tried to analyse the transaction and it seems this someone moved the ethereum onto an address and then sent it to many others in smaller quantities (tornado cash or the likes?): https://etherscan.io/tx/0x246e8912883288ced56981de10b37d661fff29354c45daf0679f6e19775ebee1

Is there anything I could do to look further into it?

Edit: I did not share my seed phrase nor store it online and after March 30 I removed any connected apps to my metamask account.