Did you get one made for a 2qt/ltr jar or are you using one of the shorter 1qt/ltr filters? Pretty sure you should be able to get plenty of grounds in this?

https://www.amazon.com/Stainless-County-Line-Kitchen-Infuser/dp/B01LZUK35H/ref=mp_s_a_1_6?dchild=1&keywords=cold+brew+filter+1%2F2+gallon&qid=1623814832&sr=8-6