I am a freelancer since the end of 2019. Now I am completely focused on the development of Mapdoc, which is a StoryMap authoring and publishing tool based on Ghost and Cesium.
You can have the short introduction of Mapdoc from the following post:
And you can also get the realistic feeling of it by the demos here:
I hope what I have done is helpful for the individual publishers.
If you are interested in my work, just drop me a line. Any comments is welcome.