LebVit

для создания команд лучше использовать @bot.command() ...
+ commands.Bot, а не discord.Client.

from discord.ext import commands

intents = discord.Intents.all()

command_prefix = "!"
bot = commands.Bot(
    command_prefix = command_prefix, 
    intents = intents, 
    help_command = None
)

COMMANDS = [
    "refresh"
]

@bot.event
async def on_message(message):
    if (message.author == bot.user):
        return

    elif (message.content.startswith(command_prefix)):
        if (message.content in command_prefix + COMMANDS):
            pass
        else:
            response = get_city(message.content)
            await message.channel.send(response)

@bot.command()
async def refresh(ctx):
    refresh()

bot.run(TOKEN)