SURRENDRING GST REGISTRATION Regarding

I want your guidance for surrendering the GST Registration. Our charitable trust lets out its properties for commercials and receives rent more than Rs.15 lakhs annually.It got registered under GST Act when GST Act comes into force (i.e.01-07-2017) as the then threshold limit s Rs.10/ lakh .Now from 1st April 2019 threshold limit has been increased to Rs.40/ Lakhs for GST registration.Please let me know,shall our trust surrender the GST Registration based on reasons of threshold limit increase and continuing the letting.So please advise me it will be a great help.