TypeError: can only concatenate list (not "str") to list Ошибка на питоне

Это мой первый пост на stack overflow

Вот ошибка:

Traceback (most recent call last):
  File "start.py", line 57, in <module>
    Дача - 3(40000$)"""), "random_id": random.randint(1, 2147483647)})
TypeError: can only concatenate list (not "str") to list

Вот код:

import vk_api
import random
import time
import datetime
import sqlite3
# token
token = "92c9c824e08f89deed7bc3e35429fe1d9e946b02838ee2764bc3a67864468439b9d1b19a88c8d26329a9d"


vk = vk_api.VkApi(token=token)

vk._auth_token()


# conf
global db
global sql
db = sqlite3.connect('server.db')
sql = db.cursor()

sql.execute("""CREATE TABLE IF NOT EXISTS users (
    name TEXT,
    user_id TEXT,
    cash BIGINT,
    power BIGINT
)""")

db.commit()


while True:
    try:
        messages = vk.method("messages.getConversations", {"offset": 0, "count": 20, "filter": "unanswered"})
        if messages["count"] >= 1:
            id = messages["items"][0]["last_message"]["from_id"]
            body = messages["items"][0]["last_message"]["text"]
            if body.lower() == "начать" or body.lower() == "помощь":
                sql.execute(f'SELECT user_id FROM users WHERE user_id = "{id}"')
                if sql.fetchone() is None:
                    user_info = vk.method("users.get", {"user_id": id, "fields": "first_name"})
                    user_name = user_info[0]["first_name"]

                    sql.execute(f"INSERT INTO users VALUES (?, ?, ?, ?)", (user_name, id, 0, 1))
                    db.commit()
                else:
                    sql.execute(f'SELECT name FROM users WHERE user_id = "{id}"')
                    result = sql.fetchall()
                    print(result)
                    user_name = result
                vk.method("messages.send", {"peer_id": id, "message": user_name + str(""", мои команды:
                Профиль
                Казино [сумма]
                Кубик [грань]
                Недвижимость [id]:
                Дом - 1(100000$)
                Машина - 2(50000$)
                Дача - 3(40000$)"""), "random_id": random.randint(1, 2147483647)})
            elif body.lower() == "Профиль":
                vk.method("messages.send", {"peer_id": id, "message": "Скоро!", "random_id": random.randint(1, 2147483647)})

    except Exception as E:
        time.sleep(1)