On Instagram, the number of hashtags in your post can be significant. 30 is the maximum for each photo or video, but if you're looking to build an engaged audience, then 11 should do it! Make sure they all relate specifically, though - just using "repost" as one would suggest that every other word will apply here too.
Hashtags are great on Instagram because not only does posting with them give followers more opportunities to show support (likes), spread awareness about new products/venues, etc., but these same functions also mean people see what else this user posts throughout their daily