Advice on rescaping my tank

I've had my tank up in running for almost 2 years and it has potting soil capped with sand. I've noticed recently plant growth has slowed down quite a bit since when it was new plus everything is a little overgrown and plus I have plants that started growing in not the greatest places and want to rescape and refertilize the soil. Is it best to tear it down completely and put new soil in or could I just put a bunch of root tabs in and rescape. Another problem I had is a baby Amazon sword decided to start growing like right in the middle of tank but closer to the front and it has now gotten bigger than the mother and has pretty much taken over most of the tank. When I go to remove it am I gonna pull up soil and have to reset the tank anyways. Just trying to figure out the best way to do this. I would rather not tear it down completely but have a feeling it's gonna be a mess in a half if I don't. Thanks for any advise if you have done this before.