First of all, you should explain your reels and use hashtags under it. Thus, new people or people who watch your video silently can read the information in the video without struggling with hashtags.
Then you need to choose your hashtags carefully. Hashtags that have been used millions of times are not a very good option. On average, around 100k times used hashtags may be a much better option.
In addition, if you use the same hashtags in each of your videos in the same order, Instagram may detect it as spam. This reduces the chance of your video being discovered.