Needed help/suggestions with large worlds

[R4HUL-R]

Hello, I'm relatively new to Mineways, and needed your help with rendering and filling in the grey checkered squares that are unloaded chunks all around my large main build. I wanted a smooth background without any missing chunks and wanted to know if you have any tips to quickly fill them in the world so that they don't appear near my build in MIneways and in the render. I tried increasing render distance, simulation distance and roaming around in-game, but it didn't help much. Adding ticking areas is very tedious for such a large build and is a limited tool.