I retired at age 42 using income investing (and a military pension). Many others tried using the FIRE method to free themselves from the workforce but returned to work.

The first question you must ask is if you want to retire early. If so, then you need a plan. FIRE will get you to your numbers quicker.

However, you are 100% dependent on the stock market's annual returns. It's not a good place to be if you are not adding new capital.

Income investing may take longer, but you don't sell shares to generate income. Instead, your shares feed you income via dividends. It's a much stronger way to retire in the long term. Good Luck!