Write SQL query to solve given problem: Among all the users with the average ratings of at least 4 and above of all reviews, calculate the percent that have no fans or followers.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(CASE WHEN user_fans = 'None' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(user_id) FROM Users WHERE user_average_stars >= 4