I recognized that I have a lot of drop-offs on my login page. I supported just 2 sign in providers. Google & Twitter. If a user doesn't have one of those or just don't want to use them they wouldn't sign in.
Today I've added a magic-link sign on possibility.
Just enter a email address and click the link in the mail to get logged in.
I will write another report later on to see if it really improved my login conversions.
Be sure to check it out:
https://app.splitbee.io/login