Did Instagram algorithm change?

Been pondering about this for a while. Looks like it doesn’t show posts to all my followers anymore. Most don’t even know I posted. And then when some people visit my profile, they suddenly start liking all recent posts.

Did something change with the way Instagram shows posts in feed? How to be on top of their feed whenever they open the app? Is stories the only way?

Lot of influencers I see post the same thing in their stories and ask followers to click for new post, this seems a bit redundant, and I’m wondering if there’s a better way

Also, reels seem to have more reach than posts, why is that?