Amp recording experience

Hello!

I have a problem with recording my guitar amp with a mic.

Every youtube tutorial I ever watched has told me to set the gain input on my audio interface so it doesnt clip or at arround -12db.

But that is where every youtube video ends. I have no idea what to do after that. Every tutorial is like " you set it so it doesn't clip, and then you just record and it sound great."

I have an sm57, and a ribbon mic. I also tried recording directly into the interface with my guitar.

But the problem is always the same : the signal sounds weak, far away and fragile.

I would be very thankful if someone with experience with recording an guitar amp can tell me what the process is after i record a sound that i like at -12db.

Thank you for reading!