The reason for “38 views - no reply” is you can fill several books trying to answer this age old question…
BeanZ and Tom are absolutely correct.
I used to work in a photo studio doing product shots back when 8x10" film & polaroid was still a thing. The amount of little bounce cards and mirrors used to photograph a “simple” bowl of rice is mind blowing. The same applies for larger objects. Use the sun/ flash as main light and fill in the rest. Easier said than done…but the rule of thumb, only use lights right next to cam for mug shots… never for bathtubs. The purpose of the “fill” light is to bring out what you want to “highlight”, the curvature of the tub etc, not just throwing more light into a scene.
But I think your problem starts earlier. How is your geometry? Is everything beveled?
I see it on the vanity, but the rest of the room, not sure. If you use these kind of setups a lot, I would spend the time to model the tiles/ grout (wall and floor). The textures you use look very flat. No amount of fill light can change that. Maybe a small amount of bump/displacement can help.
How does your room look like behind the camera? Your reflections definitely need something to reflect or they look dead.
Another important but difficult part are “imperfections” Finding the right balance between giving your client a clean product render and adding imperfections that makes things “real” is absolutely necessary. Your light needs something to play with.
Clearly, there are other places than this forum to find advise on interior lighting setups but I would search the gallery here for great interiors and analyze the light, materials… well everything and maybe ask a specific question there.
Hope this helps a little.