 If you liked
Grand Blue
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 ...then you might like
Spy x Family
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Both these manga are short, easy to get into and very enjoyable
If you like your comedy manga then please read Grand Blue it's so hilarious you'll not regret it(otherwise you can always watch Gintama but it might take a while to get into it)
And if you're more into wholesome feel-good manga then spy x family is worth giving a shot