Honestly, one of the best ways is to reject consumerism.
I have a 2006 Camry (that I bought in Sept 05).
I have a Samsung Galaxy J3 that I bought in Feb 18.
I bought my PC in 2011 and it runs Windows 7.
I only buy new shoes/sneakers when the old ones wear out.
I can't even remember when I bought my TV (26").
Just say no to consumerism.
If what you have still works, it is still good and you should stick with it.
EDIT:
And most importantly, I could retire tomorrow if I really wanted.
But I will most likely wait until January 2028 because while my job is stressful, it's not so stressful that I would quit prior to collecting the SS I paid into my entire teen/adult life.