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Common soap bars, they weren't really a thing until the mid 1850's and you had to make your own soap unless you were wealthy prior to that. https://en.wikipedia.org/wiki/Soap#19th_century Similarly, liquid soap which came to be around the same time.
Seat-belts maybe. Not as important as the car itself obviously, but definitely simple and super impactful.
Bicycles are pretty amazing, although there's no way you could 'build one yourself'.
Bicycles may seem simple but took many decades to get it right. Your comment also reminded me of this gallery of drawings from people attempting to create a bicycle from memory which is pretty funny https://twistedsifter.com/2016/04/artist-asks-people-to-draw...
https://en.wikipedia.org/wiki/Flying_shuttle
(How did this cause the Industrial Revolution? It made weaving so much faster, that the spinning industry had to come up with machines to supply the weaving industry.)