I normally don't make this statement but let me try to put it out there.
I know that there might be people gonna go at the HBO Max Help twitter and be like "PLEASE PICK UP OKKO SEASON 4 WE LOVE THIS SHOW." You're gonna expect the same answer from them as people did the same with other shows. If you really want HBO Max to express interest with the show (again), please email them with this address: firstname.lastname@example.org. I do not know how effective it is and I do not work for HBO Max. So try I guess. Plus making the show become a Max original comes from the HBO Max funding.