These include the absence of their profile on searches, old messages with the name "Instagram User," absence of available posts, and inability to follow or message them. Deleting or deactivating an account may look like the same scenario.
On Instagram, you may be blocked if you can’t find the person’s profile in search, their messages disappear or can’t be sent, and their profile shows no posts or followers when you open it. These signs usually indicate that the user has blocked you.