there are some problems on rcm because service recevier are not take burden of tax. if you will want business in future please take gst registration. future are not who not ragistared in gst
You are not required to get yourself registered under GST as the aggregate turnover is within the threshold limit of 20 lakh.
You are not required to pay/collect GST as you are not required to register. But your customers are liable to pay GST on the sale made by you. If they dont pay GST on your sale, then its non of your concern.