Gst registration for broker/agent

Hi Guys,

I provide services in West Bengal and I serve various textile dealers  from various parts of the country by providing agent services for selling their garments in local shops in WB. My service brokerage does not exceed 20 L threshold, but i received advise from one of my mates that I should take registration and pay GST because I provide services to dealers in different parts of the country as well so even though I don't exceed the TL of 20L, I'm liable to register myself. Please help me with the relevant advise.

Thanks.