It costs money to put a game on steam. If I had the money, I absolutely would put the game on steam
Open for donation, register your company and fill your tax, theres no renpy rpg around, so better grab it for making ton of money, also when you have a company you can have your IP registered, IP means your owning your franchise game title, if not someone else can steal it or anything, also with IP you can protect your work and deal with business agreement later on the line if someone offer you money to publish your game. RPG Renpy or VN RPG is huge marketing title in the community, possibly making hundred thousands dollars and you set for life for building your career