added two pesky lines to actually add the role

bot.py

@@ -6,6 +6,7 @@ import json
 import sqlite3
 from dotenv import load_dotenv
 from discord.ui import Modal, InputText
+from discord.utils import get
 
 load_dotenv()
 
@@ -140,6 +141,8 @@ class ApplicationModal(discord.ui.Modal):
             await user.send(f"You have been accepted to the CreatTopia Minecraft server!")
             await user.send(f"Reason: {reason}")
             await interaction.response.send_message(content="Application accepted", ephemeral=True)
+            role = get(interaction.message.guild.roles, name="CreatTopian")
+            await discord.utils.get(interaction.message.guild.members, id=int(user_id)).add_roles(role)
         if self.action == "dec":
             user = await bot.get_user(user_id).create_dm()
             await user.send(f"You have been declined access to the CreatTopia Minecraft server.")