みっつ Sorry I Just cant work out how to type the small tsu

I don’t have a problem with thinking in Romaji when thinking in Japanese. And I type somewhere in-between. Wapro romaji JYA (when using IME). Is it wrong to type this way? Does anyone else do it?

Still, I still have a problem with visualizing pitch accent. (I visualize simply in Hiragana.) I might need to specifically drill on this.