 If you liked
Isekai wa Smartphone to Tomo ni.
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 ...then you might like
Kenja no Mago
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1) Both main character died and were reincarnated in another world (well... touya reincarnated as a adolescent)
2) Both stories are set in a fantasy world
3) Both main character have almost the same clueless personality
4) Both main character are genius in the magic and can use all the elements
5) Both main character use the magic in a creative form
6) Both main character are the strongest in his respective worlds