For an image like this you could use vector shapes and Pattern preview in Photoshop. Or same way in Krita. or any vector editor supporting symbols/clones. Affinity Designer for example.
Any automatic solution like Unity Art engine most likely would break vector shapes appearance across the seams
Replies
https://www.youtube.com/results?search_query=how+to+make+a+tileable+texture+in+photoshop
Reverse image search points here: https://wallup.net/simple-background-20/
Every wallpaper is copyrighted by its respective owner. Did you find a violation? Don't forget to Contact, we'll remove it as soon as possible.