As per Notification No. 41/2020 - Central Tax, dated 05.05.2020, the Due Date to file Annual Return ( FORM GSTR-9 ) and Reconciliation Statement and Audit Report ( FORM GSTR-9C ) for FY 2018-19 has been further extended to "30th September 2020 ( 30.09.2020 )."
As per Notification No. 47/2019 - Central Tax, dated 09th October 2019 read with Circular No. 124/43/2019 - GST , dated 18th November 2019, "Filing of Annual Return ( FORM GSTR-9 ) for the FY 2017-18 & FY 2018-19 has been made OPTIONAL for those taxpayers whose Aggregate Turnover does not exceeds Two Crore Rupees."
Moreover the Annual Return shall be "Deemed to be Furnished" on the due date if it has not been furnished before the due date for FY 2017-18 & 18-19.
Therefore, since your Aggregate Turnover exceeds Rs. 2 crores ( i.e. Rs. 2.25 crore ), you have to compulsarily file Annual Return for both the Financial Year ( 17-18 & 18-19 ).