How to get the sale data for previous three years in bigquery

Question

Get the yearly and monthly data for previous 3 years or 2 years where sum of sale of previous years should be in column headers. I'm a beginner to the sql and bigquery. Something as shown below.

Months	Sale 2023	Sale 2022	Sale 2021
Jan	50	40	50
Feb	40	20	40
Mar	20	50	20
Apr	50	40	50
May	40	20	40
Jun	20	20	20
Jul	50	50	20
Aug	40	40	50
Sep	20	20	40
Oct	50	50	20
Nov	40	40	50
Dec	20	40	40

I wrote the query

WITH previous AS (
  SELECT
  EXTRACT(YEAR FROM sell_date) - 1 AS previous_year,
  EXTRACT(MONTH FROM sell_date) AS month,
  SUM(sum_sale_value) AS monthly_sellout
  FROM `project.dataset.table`
  WHERE
  EXTRACT(YEAR FROM sell_date) = EXTRACT(YEAR FROM CURRENT_DATE())
  GROUP BY
  previous_year,
  month
)
SELECT 
  month,
  COALESCE(SUM(monthly_sellout), 0) AS previous_year_monthly_sellout
FROM
  previous
GROUP BY 
  month
ORDER BY 
  month;