Details about how withdrawals works are located here: https://help.market.envato.com/hc/en-us/articles/202821420-When-Will-My-Withdrawal-Be-Processed-
Basically withdrawals happen monthly, on the 15th of each month. Example: all the July earnings are calculated at the end of July, and then sent to you 15 days later on 15th August.
So there is really only 30 days between each withdrawal (15th to the 15th)
The best thing to do is create more items so there is more to withdraw the following month
Best of luck!