Inflact defines the hashtags groups based on the number of posts uploaded with a hashtag. Thus, you can estimate the competitiveness of a hashtag before using it.
Frequent hashtags are overused and count up to several million posts.
Average hashtags are less competitive but sometimes spammy. They count up to several hundred posts.
Rare hashtags are more specific and tied to a certain niche.
Use hashtags from various categories when you add them to your set.