Sometimes, the problem isn't on your end.
: On a personal, trusted computer, you can select "Remember Me" to save time on future visits. Avoid this on public or shared computers to protect your privacy. Enable Two-Factor Authentication (2FA)
Are you logging in for or managing a business page ? Have you encountered any specific error messages recently?
: If you have logged in on that computer before, you may see your profile picture on the left side of the screen; clicking it allows you to sign in quickly.