Which of the following is not good advice to follow when formulating an
analytic thesis?

Answer:
Decide on a main claim and stick to it exactly throughtout your drafting process.
Explanation:
An analytic thesis can be defined as a thesis which analyzes a text step by step and to help readers understand the text better.
To formulate an analytic thesis it is not a good advice to draft the paper with the main claim at the center and coherently stick to the main idea.
Drafting, in writing, is the second step, which involves writing down of thoughts in complete sentences. This is an important step in writing process as it helps the writer to search for the main idea through these ideas. Drafting process does not require to stick coherently stick to the main idea that one wants to present in his/her thesis. These draftings are helpful for the writer to scrap the ideas and later fit the claims.
Thus from the given options the imprudent advice would be option second.