Overuse and repetition words are likely due to a lack of vocabulary and a lack of editing. Web novels are rarely professionally edited due to their rapid release. And mine?
It's the same... my narrative uses a lot of repetitive words that can be boring. I'll probably edit it again if necessary, considering I'm more focused on finishing the story than writing beautiful prose.
Here are some repetitive words that I often use: nodding, smiling slightly, pursing my lips, blinking my eyes, walking, standing up straight, mumbling, gasping for breath, looking, turning my head, turning around, stroking, etc.
However, if I want to publish my fiction as a book, editing is certainly an urgent need.