ad for US client in newspaper is Export?

I AM PUBLISHER OF NEWSPAPERS RELATING TO EXPORT AND IMPORT IN INDIA. I HAVE PUBLISH ADVERTISE OF USA CLIENT IN MY INDIA NEWSPAPER AND CHARGED $ WITHOUT GST.SHOULD I APPLY FOR LUT? WHILE FILING GST 3B I HAVE SHOWN IMPORT IGST WITH ALL OTHER ITC  HENCE 2A IS MISMACHING. SHOULD I CORRECT THIS MISTAKE?

WHILE FILING GST 1 I HAVE NOT SHOWN CASH SALES THOGH IT IS SHOWN IN 3B
SHOULD I CORRECT IT?