Monetization is an extremely important stage, but you still need to develop your game before it. You can monitor the game through Patreon, you can also sell stickers, prints, 3D miniatures. In order to monetize the game as much as possible it is worth thinking about developing a website like browser games do https://www.friv5online.com/ and reduce in-game donations. That way you get fan support without much coercion.