MY model in blender
Model in skethfab
how to clear this blur???
Could you provide a link to your model please?
Paletted PNGs are not supported by the Sketchfab textures processing so there is no way to prevent such images to get blurry at the moment.
It seems that you added the texture through the 3D editor, but you might get some luck by uploading it with the model, as the process is a bit different and the texture is very low resolution.
I hope it helps