AishwaryaEAYou are using the dynamic conversationLastPostTime to fetch incremental data. This is the correct solution. Api will only return you 25 records or any number you specify, but there is a max number. To solve this, you need to use pagination method.
So first, get a total count of your data. Then use multiple GraphQL query to loop through the pagination. You can use Python or nodejs to achieve this if you are working on a data project. Or you can use frontend JS to loop through the pagination in your customized UI.
