Hey, I have posted an assets pack on itch.io since one week and it is not downloaded one time. I would like to know if you have tips or what I should improve to get more downloads.

Here if you want to check how I am going: https://mrquickgame.itch.io/2d-pixel-nature-pack

Well, it's a short time. But yeah, you need to work on the page. :)

For one thing, your color scheme is unreadable unless I select the text. Make the background much lighter and the text much darker, or the other way around.

Second, pixel art has its tricks. When offering enlarged previews, pick "nearest neighbor" as a scaling algorithm, to keep them pixelated. But don't expect people to "just resize it" for use in their games otherwise! It doesn't work that way. What size are the originals anyway? Typical sizes are 8x8, 16x16, 32x32 and so on -- in other words, squares of powers of two.

Third, I'd like to see a preview scene using a bunch of your sprites, to get an idea of what it will look like in a game.

Hope this helps!