please, how to avoid repeating the background???????

Hello, I have made with the tiled background object the texture of the ground, my concern is that I find that it has a very pronounced repetitive effect on the texture, my texture is not homogeneous, how I could do to avoid as much as possible this repetition of the sprite and that it makes more a plain texture. To see better what I mean I put a link to a screenshot of my map. Thank you in advance for your great advice.

dropbox.com/s/9utjvpso1o24zdq/Capture%20d%E2%80%99%C3%A9cran%202019-02-16%20%C3%A0%2016.21.55.png

I was able to solve my problem of texture that repeats itself, I found how with a very homogeneous texture thanks to a windows and mac compatible software, it is a versatile software to work on our very practical and powerful texture, I put the link to the website of the software if ever it interests a person who would like to work a texture like me or create one.

pixplant.com/index.php