@ningkantida Go for it! Just like @Miraz, I love seeing a diverse timeline and follow quite a few people writing in languages I don't know. To make sense of their posts, I use Safari's built-in translation feature. My own posts are occasionally in Swedish.
What shows up on your timeline is controlled by the feeds on this page. By default, your main feed that contains all posts is set up there, but you can change that to whatever feed or feeds you want. Your blog provides feeds for every category, so you could have categories for English and Thai and add only the English category feed to your timeline. But, again, please don't do that. I want to see your Thai writing here. 😊