My only suggestion is, keep on blogging in Thai. I know you'll get less upvote/reward for now, but that will help your local audience to find your article AND this site via Google Search. Don't forget to include the generic and cliche "How to make money blogging on Steemit" in Thai language, that will attract more writers and bloggers. Then the network effects will make your community effort become easier.

You can check out Acheh & Indonesia community and learn from them how they build local userbase.