To get a monthly dividend of 3,000 yen, it's 36,000 yen per year, so if you have a principal amount of 1.2 million yen as 3% per year at VYM, it would probably come true.
I think that increasing the amount of money you can freely use to 3,000 yen a month means that you have quite a few dreams, so it might be a good idea to continue investing in high-dividend stocks steadily, depending on your purpose.
$Vanguard High Dividend Yield ETF (VYM.US)$

The stock prices of many US stocks have continued to rise, such as the S&P 500 breaking record highs in 2021. There are many experts and analysts who believe that further increases will continue in the medium to long term. However, due to negative factors such as tapering and interest rate hikes, there are parts where the immediate market price is uncertain. Since it is conceivable that it will decline in the short term, it is important to operate while managing risk.
$Vanguard High Dividend Yield ETF (VYM.US)$

The main constituent stocks of VYM are as follows.
・JPMorgan Chase & Co.
・Johnson & Johnson (J&J)
・Home Depot
・Procter & Gamble (P&G)
・Bank of America
・Comcast
・Pfizer
・Cisco Systems
・ExxonMobil
・Verizon Communications
Since VYM is benchmarking the FTSE High Divided Yield Index, high dividend yield stocks are the focus.
VYM is a “Vanguard US High Dividend Yield ETF (Vanguard High Dividend Yield ETF),” and it is an ETF that aims for investment results linked to the FTSE High Dividend Yield Index. The FTSE High Divided Yield Index is a market capitalization weighted average stock price index composed of high-dividend yield stocks from the US stock market.
$Vanguard High Dividend Yield ETF (VYM.US)$