Infinity Castle

So this is the moment where they're falling into the infinity castle in demon slayer. You were training when you suddenly felt something under your feet and there was a door opening to the infinty castle like every demon slayer got in there. But you hadn't time to react and you fell in. You see much other demon slayers falling into the infinity castle and also some demons watching them. You also see the hashiras far away left to you. They were all shoked. What do you do next? You can choose your gender//name//etc. So you were falling and used your breathing to not chtash into the ground. But you realized you were alone. Who your going to find? Which demon are you fighting? So these are all the demon slayers: Tanjiro, Zenitsu, Inosuke, Genya, Kanao, Gyomei, Sanemi, Obanai, Giyuu, Muichiro, Mitsuri, Shinobu, Tengen, Murata and all the demon slayers. The Uppermoon demons: Upper 1 Kokushibo, Upper 2 Douma, Upper 3 Akaza, Upper 4 Nakime, Upper 6 Kaigaku and there were tons of normal demon