I also think that the themes of her songs repeat themselves sometimes, and more often lately, but that's ok to me.
By writing lyrics, you can only reflect what you see and feel in that very moment.
Of course some of her older lyrics are impressive and unique. But most of them were talking about sad or dark feelings in general, and imo it always looks more intense to write about those. Also, of course if you have a strong emotion and write it down, the listener will feel that in the final song. I guess it also has to do something with what you look for in a song as the listener, or how you yourself feel atm.
If she is happy now, then I am happy for her and appreciate her happy songs. I think it's natural that when you grow up, you are not in that state of confused feelings anymore, at least not all the time.
Plus, for writing about those themes she does nowadays, ayu still manages to convey that spark all her songs have. At least to me
