Registration Issue

The assessee during the service tax regime had his place of business in Delhi and after migration got a Delhi GST number whereas the assessee has now moved his place of business to Noida.

What should the assessee do now? should he get his registration changed to UP registration or get a new registration in UP and get Delhi registration cancelled??

which is the best way forward and what's the procedure?

would appreciate if someone could help. TIA.

Assessee here is a Partners Firm.