Who are your followers, what percentage is male or female and what is their age? Where do they come from and at what times and days are most of them online? You can check this in the 'followers' section in statistics. With this data you can better tailor your telegram data content in terms of content and timing, and you can also better determine the target group of your possible advertisements. Especially dig deeper into the locations, interests and behavior to learn even more about your target group.
Your behavior
Without a business profile, you only know how many likes and comments you get per photo. With a business profile, you can also see the views of your photos, videos and, recently, your Stories. The views are important to see which of your photos and videos are shown more than others. The views are the number of times your post is shown in people's feeds. This always differs from the number of people who follow you and is an important indicator of your visibility.
You can go back as far as you want, from the moment you switched to a business profile, measurement is done. Instagram Stories without a business profile are not saved at all and are not counted. This does happen in your business profile, up to 14 days. Another big advantage of a business profile.