Reels on Instagram have been around for a few months now, so Instagram has released some information about ways that will help and hurt the likeliness of whether your post will end up on the explore page. We took some of the important points and put them in the below reel
One of the most important things to remember with this is that posts with a watermark on them are less likely to be discoverable. This is most likely targetting users who create their short videos on TikTok then reupload to Instagram.
For more detailed information, the following post is from the Instagram @creators account, a really useful place for information