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When I looked into my status, I noticed that several of my Skills and Title Skills had been leveling up passively over this entire time. They had become stronger quite easily as I practiced my magic every day diligently, swung my blade, and also my axe, and well, they naturally got into a higher level! That simple, it is nothing too hard to do, just constant repeated efforts net some results over a long time, although two weeks is not really THAT much, so we could say that my progress is fast and accelerated. I've learned that people with Divine Protections receive enhancements to the EXP earned and even the Skill Proficiency earned, so they naturally grow stronger and better quicker than other people.
Check "The Protagnist's Sister Is Actually the Strongest"!