Girls, I'm worried, today I noticed that my second breast stopped fill…

Girls, I'm worried, today I noticed that my second breast stopped filling up, it became smaller, sorry, like a rag? started squeezing milk with hands as if eating, but very little, not like before, what is this and how should I be? I feed one more often, but I also feed the second one, but rarely, I've been attaching myself more often, but still doesn't come