How do I get the seams out? First time modeling - Lounge - Nomad Sculpt

I probably made a mistake by doing it this way, but I modeled the basic shapes with primitives then did a basic merge to put them together but I still have the seams between the shapes. How do I fully merge without ruining my topology?

How do I get the seams out? First time modeling - Lounge - Nomad Sculpt

How do I get the seams out? First time modeling - Lounge - Nomad Sculpt