Good conversion is considered to have CTR of 5-6% and above.
Stop promos with a conversion rate below this level, and continue only with the most effective promos.
How to increase a conversion rate?
If you run 3-4 promos, and in a few days you see that the conversion is low - remove and add new promos. If CTR stays low, work on your content. Post high quality photos, write good description on the profile. Try to make your account interesting for others.
Customer support service by UserEcho