>>22906899I have the same problem and the only advice is read more.
For instance, try reading good books or good fanfictions and see what makes their dialogue appealing.
A good example in my opinion is
https://www.fanfiction.net/s/10322999/1/A-Little-Tête-à-TêteAlso, there's this chart I found once, but it's just a help, not a guideline. Not really sure what it's worth though.
Try to imagine how your characters move around when they talk, the expression they make. Then put it on the paper.
