$20k in btc stolen

Opened up my crypto onchain wallet today to see $20k in btc was withdrawn back in February. I don't check it often and can't believe it. No idea how it happened as the transaction doesn't show in the app but does on blockchain.com.

Really fucking sucks, no idea how it happened. Never shared my phrase. Fuck

Edit: digging in more it looks like I was exporting transactions on the day the withdrawal took place. I'm guessing I accidentally clicked a malicious link and linked it to my wallet. I'm just trying to get over the sadness of fucking up.