I could probably reopen it for submissions, but since there is that bug in itch.io they still havent addressed, which means that if you go to main page right now, it will read "This jam is over" instead of voting time has started, and there is actually no way to even vote, I would suggest you would simply submit to Playtest & Feedback Exchange Jam #5 rather: https://itch.io/jam/playtest-feedback-exchange-jam-5
I have also noticed that due to this situation of it reading like Jam has ended, submissions coming on last days dont get much playtests either, probably since people think it is already over, when it is actually supposed to be the time to playtest and send feedback actually.
Therefore, sending now to Playtest & Feedback Exchange Jam #5, when submissions time has only started yet, will likely give you much more playtest and feedback than submitting to #4.
But if you for some reason want to join specifically the Number #4 Jam, I can take a look for changing the submission time for longer.





That Picture there on the top-right, clicking it just shows the picture separately, doesnt start anything.