You can try these applications instead, there are supports Misskey, Bsky, Mastodon even X account in one apps + many useful features such customizing panel, tab, or list, AI translation, etc. Although Threads are minus at least it should work on your MK account.
https://github.com/DimensionDev/Flare

If you gonna learning Japanese proficiently, you should use another app instead this app which are made effectively help learning for hone skills between hiragana/katakana and N5 to N1 kanji without struggle.
So, what do you think about our decision and any alternative app for effective learning?