how to improve signal and speed on home internet¿

Hola All,

You'll have to forgive me, I'm reading this forum and not understanding a ton, but hoping someone's still watching it. We've been having horrific service for the last few days, 3.65mbps down and 0.73 up, and i'm currently sitting next to the gateway. The signal on the can has never been higher than 2 bars, no matter where i go in the house. It resides on in in the SW corner of the house. These are the stats I currently have, no secondary connection whatsoever. Can anyone offer assistance? The LAST thing i want is to return to comcast, but I work from home and we stream everything; can't have speeds like this.