As a test, I asked ChatGPT to edit the sentence:

Me: Can you make the following sentence more succinct? "One thing you can do to improve your writing is to avoid starting each new sentence with linking words because too many of these can make your writing monotonous and fragmented."

ChatGPT: To improve your writing, avoid starting every sentence with linking words, as it can make your writing monotonous and fragmented.

There's an interesting "resource" for you. Generally, though, aside from digesting The Elements of Style the best way to learn to write is to read good writers.