Hello. I created this stereogram in the Affinity Designer program and at https://www.easystereogrambuilder.com.
I hope that you can consider it.
If viewing causes difficulties due to the reduction in image size by the site, then here is a full-sized file without distortion.
https://drive.google.com/open?id=1R5RoTPo0TMP7yz4MY60v6HSIZ0s_HUsa