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Sup guys, I have a little dilemma and was wondering if you all had any ideas.

We track vocals in a bathroom with bass traps on every side, but would like to somehow make it so there is very little sound heard from outside.

Problem one is this:

There's a 1 inch gap between the bottom of the door and carpet, I was curious if there are any types of seals for this scenario?

Other than blocking what's under the door the only other idea I had was to just put a mattress in front of the door.

Extremely ghetto but I need this to be as quiet as possible, would love any help! Thanks.