It's maybe not the most helpful, but the best way I can explain it is put yourself in the mind of the character. think about what THEY would say, not you. believe it or not, but reading is a skill - a good reader will be able to accept dialogue is good if it's self-consistent.
other than that, research communications - not just human, but all species. how do cats communicate without vocal cues? Or dogs? Or ferrets? Take cues from animals. But most importantly, only about 25% of what you say is specifically the words. That's why online text-based communication is so difficult at times. many people add what they EXPECT your tone and facial cues to be to your words.
Which leads me to this: Approximately 30% of communication is tonal, and 45% is entirely non-verbal - facial cues, body language, etc. It can be difficult to communicate these finer points in writing, but these smaller fine points are what separate a good author from a great author. But at the same time, trust your readers. you don't have to hold their hand through the entire book. just like in painting, what you DON'T show can say just as much as what you DO.
exposition should be at the beginning, when you're introducing the world. You can have smaller exposition dumps throughout as the character learns new things (common in isekai), but rely more on characters communicating like a conversation. Also, you can break up exposition dumps with other events.
"This is how magic works in this world."
"Cool, lets go attack these monsters."
*After the fight*
"Alright, as I was saying..."
If you're bored writing it, the reader is going to be bored reading it.
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