In looking at your site / facebook and instagram - Your biggest audience / followers are instagram - however people can get turned off by seeing "sales" post so you need to find a balance. Your issue with Facebook is you have 100 followers / likes so if you post something you are only getting exposure to those 100 folks.
If you have an email list of past orders I would do some sort of refer a friend offer perhaps or just reach out and ask people to share a post - perhaps do a contest and give a free candle or something.
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