If you want to introduce the game to more Japanese people,
I recommend that you translate your game into Japanese.
"triacontane" and "yamachan" have released plugins with the automatic translation function.
If your game is blue film, you can use "BOOTH". https://booth.pm/ja
In there, you can set your game 0 yen.
But you have to get pixiv account.
Let's use pixiv for advertisement with tag 「フリーゲーム」「RPGツクールMV」.