how can i improve my singing?

I’ve been singing into a tuner and its just pitchy. It seems the less effort and power I put it in, the more I’m on pitch but it sounds weak. Sometimes I’m singing the wrong note and its on pitch (I can tell its the wrong note). My scales are not too bad, its still pitchy though. A lot of the time I’m flat. It makes me wonder if I’m tone deaf.

I have been working on recognising notes and breath control, but I don’t know where else to go. I feel like I used to sound better but I developed bad habits.

I’ve attached a video, sorry if the TV show is too loud.