 If you liked
Gundam Build Fighters
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 ...then you might like
Knight's & Magic
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Both are based on the love of mecha. The MCs are extremely talented at designing cool and unique robots based off of predecessors. The atmosphere in both is light and fun. The "Isekai" portion of Knight's and Magic does not factor in a huge amount and it was only mentioned in the first episode to give reason for why the MC is so good at robot design and "programming".