just barging in here, as i am writing in english myself despite not being a native english speaker, i thought about writing in my native language as well, but i feel that the effort of translating my own work would distract me from writing new stories instead. it could be useful though if i am stuck with a story or face writers block, where i could use the translation work to revisit my stories from a different perspective that might bring new ideas. but i never tried that, so i don't know if that would work.