Use the cameras world matrix up down right or left vectors and add them to the cameras position then pass that back into your CreateWorld function to move the camera properly on the cameras local axis.
Opposed to the system coordinate axis.
// So here we initially defined position and point a camera object in the world for the first time..
Matrix cameraWorld = Matrix.CreateWorld(new Vector3(0,1f,0), new Vector3(.707f, 0, .707f), Vector3.Up);
// When updating we want to move the camera on its own local axis, for example here to the left.
cameraWorld = Matrix.CreateWorld(cameraWorld.Translation + cameraWorld.Left * distance , cameraWorld.Forward, Vector3.Up);
// distance here is how much the camera is moved as the matrix left right up or down is unit length.
// If you allow the ability to roll your camera then instead of the above use the cameras up.
cameraWorld = Matrix.CreateWorld(cameraWorld.Translation + cameraWorld.Left * distance, cameraWorld.Forward, cameraWorld.Up);
Create the view matrix with CreateLookAt from that camera matrix.