I have those MESH inside house and a CPE outside. But the signal on the camera about a 10 meter away is not adequate to run the wifi camera seamlessly. How to do it

I am using TP link deco system in my house, M4 and M5. It's quite Ok. Now need to expand the mesh wife to some other areas of my house. I saw "AX 3000 whole home mesh wifi 6 system" selling in quite...