Do your customers know that you are open for business?
If you are open during this period, you need to make sure that people know about it.
This became clear to one of my clients when he realised that many of his customers were walking past. They did not know they were open. Now he has a big OPEN sign in the front window.
Passers-by need to know that you are open and when.
If you are closed and intend to re-open, you need to tell them clearly when exactly you are opening up again. If you do not know then try to make it as clear as you can.
Also, post regular updates on your social media.