Recruit fixed teams with responsibilities focused solely on the creation of new regions. I really like this game, but what discourages me the most is the lack of new content regarding relevant story quests, like starting with new level 1 Pokémon, training them, and completing gyms... the standard experience of every Pokémon game. The feeling of finishing a region and hunting for new Pokémon is completely lost in PRO. So my suggestion would be to recruit teams focused only on creating new regions like Astrella, Unova, Kalos, Alola... You can be sure that when new regions are released, the servers will be packed with players because many are just waiting for that to come back and play.