Gluten Free Buckwheat Groats Sourdough Starter

Hi Forum members – please help me with your suggestion for this buckwheat groats sourdough starter.

I found this recipe on the net and it seems simple to make this gluten free sourdough starter. I have had no luck making a starter.

https://www.youtube.com/watch?v=5LGRhqxiNXY

I need some help regarding the rising of the sourdough bread when I use the starter.

Most breads gluten free are mostly quite flat am aware, but once I make this groats BW starter how do I incorporate it – so that the bread will rise alittle.

On the website she has a recipe for the bread, but it is mostly flat.

Appreciate your kind help.