Make sure you have 2FA enabled if it’s your main account. That’s the best way to secure it. I’d also update your pw while you’re at it since someone attempted to get in. Bitwarden is a great PW manager (free) and it can generate a super complex password which it’ll remember, and you can also auto fill with a quick shortkey when you want to login
Edit: Here’s a 2FA guide that $(you need an account to see links) made btw: (you need an account to see links)