Minecraft Java in the background pixelated?

I have long been the problem Minecraft in the background is so blurry pixelated someone knows what I can do in the settings Resolution change brings nothing has already tried so much but nothing helps need help!

Other Textures Pack?

Well, your resolution is not very high, if you want more details then you need a screen with a higher resolution.

Your current screen has "only" 1280 * 1024 (= 1310720) pixels to represent things.

For comparison, the common resolution is 1920 * 1080 (= 2073600) pixels, which is just under 60% more pixels = 60% more details.

Optifine and there with the settings play, z.b. Make Mipmap higher