The Explore tab allows you to discover posts that Instagram curates for you personally. These suggestions are based off various factors, such as existing users you follow, your contacts, your previous likes and more.
If you'd like to adjust your future recommendations, you can indicate to Instagram that they should show you fewer similar posts.
Right-click on a post and select
Show Fewer Posts Like This from the contextual menu.
Left-click on a post to view the details, and from the button menu, select
Show Fewer Posts Like This