I love Somi, but let's be real. She has released 3 songs over the 27 months since she joined The Black Label. It sounds like she'll release an album soon, but she is probably the least productive idol ever, literally.
I think the problem is that Somi wants to be involved in writing all her songs (Somi has writing credits on all of her songs), but she is a young amateur at writing, so it is taking a long time for her to make enough songs for an album that meet Teddy's high standards -- even with TBL producers' help (maybe it took so long for BP solos for a similar reason). Also, because Somi is spending more time on writing than a normal young idol she doesn't have as much time to produce other content. So we end up getting much less content from her.
It is probably good for her in the long run to gain writing experience now, but she is slowly losing fans due to her very low activity (it's actually impressive how large her fan base still is, considering her low activity). Maybe it would be better for her to write less songs at first (maybe 30-50%), and then slowly increase her writing contributions as she gains more experience.
Or maybe she'll release a full album (12 songs) within the next few months, making her song output about average for young solos (5-6 per year). More realistically, her upcoming album is probably a 6 song EP, counting WYWF.