I'm thinking of knocking on the doors even when I'm alone in the house.
That feels unnecessary, why do you need to knock?
I want to break the sound of silence.
It can feel weird to just have silence around but you don't need to knock to hear noise. You can listen to music or the television to stop the silence.
Are you serious? You are telling me to listen to music or television?
Yes, I am serious. I do not think there's anything harmful about knocking on your own house, but it feels very unnecessary specially if you have a TV or a music player inside your house. You can entertain yourself while having a downtime, or maybe call or video chat someone really close to you and catch up with them.