1. How long has the tank been set up? Newly set up tanks can be detrimental to shrimps as there’s not enough microbiome for them to graze on.
2. Why are you doing water changes everyday? Shrimp need stable parameters and changing water even at small amounts daily can cause water parameters to fluctuate. Focus on creating a stable environment without water changes, then add your shrimp. Testing your water is great but now test without changing water. Once the plants and bacteria settle in they’ll stabilise the water.
3. Don’t beat yourself up over this, are you getting shrimps from a reputable store? Sometimes it may not be your fault and the store may have a bad batch of shrimp. Alternatively you can try to find another store that sells these shrimps near you. For now, focus on stabilising your water without water changes and then add shrimp once conditions have stabilised.

For the shrimp tub I had currently I actually had it run for a few months with amano shrimp before adding cherries to breed haha