Gst itc from july to december claim in january

I have received a lot of inward supplies from August 2017 to December 2017. However since GSTR 2 is not working I did not file Input Tax Credit for the inward supplies. The input tax credit has now become a significant amount. Can I claim all this accumulated input tax credit in one go in my January returns as part of my GSTR 3B filing.

I am nervous that I have lost all the input tax credit which I have not filed in any of my GSTR3 returns. GSTR2 is not working for me for any of the months. Please help.