 If you liked
Ore wa Mada Honki Dashitenai dake
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 ...then you might like
Hitori Koukan Nikki
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Story about an adult as they try to live as they would like to despite aging and struggling with both their aim and interractions with the world around them. Both protagonist also write manga in those manga. Both manga also have more cartoonish artstyle that is atypical for manga.