 If you liked
Honzuki no Gekokujou: Shisho ni Naru Tame ni wa Shudan wo Erandeiraremasen
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 ...then you might like
Tensei shitara Dainana Ouji Datta node, Kimama ni Majutsu wo Kiwamemasu
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Both animes are about main character being reincarnated in isekai as a child that is obsessed with some subject. Their both living in their own world, focusing on their pastimes which makes them ignore everything else. Both animes are also light, colorful and make you watch whole series at one go.
The biggest difference is that Myne is born in the mob and Lloyd is a seventh prince.