I have made three cheap changes to my belt system.
These changes reduce belt stretch, reduce the need to tighten belts, show me when a belt needs to be tightened and makes tightening much easier.
Changed to steal core belts for X and Y axis
3D printed and installed the KreekLove belt tensioner on my x axis https://www.thingiverse.com/thing:3049613
Added a spring to the Kreeklove system which ensures the belt remains tight and shows me if it is loose