New pages keep disappearing from the SERPs despite being indexed

I created a couple of pages 1-2 months ago and they got indexed in a day or two. They started appearing for keyword searches around the 3rd or 4th page. They kept bouncing from page 2-5 for 2 weeks and then they stabilized around page 3. Now, 1 month later, those pages dont appear anywhere in the first 100 results. I check GSC and they are indexed. Also if i search keyword + brand name they do appear in the SERPs. But not when I do only keyword searches. Is this normal for new pages or did I fuck sth up?

It's the new page bounce. Give them time. If they aren't parasites on authority websites they have no place on page 2 so soon.