FY 2017-18, DIFFERENCE BETWEEN GSTR 3B & 0GSTR 1 TAX LIABILITY

Dear sir 
For F Y 2017-2018 , In Feb 2018 Actual Tax was Rs. 37,578.2 but unfortunately while filing GSTR -3B AMOUNT SHOWN AS rs. 3758.2.
Later on in March 2019 the difference amount of Rs. 33,819 we have shown in 3B return under ITC reversed table unfortunately... I think it was disclosure mistake... Now what can I do sir. . where to show it in GSTR-9?


thanks in advance