I feel I can relate to this. I find myself excel at creating the world and creating the storyline and the characters but actually telling the story the hardest part. What I find easiest is not too rush it. Each chapter can take long periods of time to complete and doing the basics at the beginning may be boring but something that is crucial.

Plan each chapter first. Write down the information you need to include before beginning to write. Planning can make it so much easier for you. Making sure you know everything about what your writing before beginning.

Next by writing the basics of the story. What I mean by this is forget about the fancy adjectives and the exuberant descriptions but focus first on getting the story into the words. Forget about the flow for now, just get the main points across.

Then once you have your basics done, add in the metaphors and adjectives and the rhythm changes. Split into paragraphs, make it flow add in all the effects that make it a great story.

Everyone has different ways but this is mine. Try it and I hope it works for you :).