The original is fine but I changed a few phrases to make it sound slightly more professional. Good work!

I count 79 words in your answer (clearly Writing Exercise 354 etc isn't part of the answer) Actually this question makes no sense and the English isn't good. It asks you to explain why you are not placing orders, then why you are!

This is too many words for the exercise instructions. You are instructed to write 60-80 words. This is 84. You also have not followed the instruction: 'telling him your plan for next year' - there is no mention of the plan in your writing. Here is an example of what you could have written (77 words): Dear Mr. Williams, Thanks for your letter. Due to the ongoing pandemic, we have been forced to decline some orders for next year. Our plan is to reduce storage overheads so we can order smaller quantities. We would be very interested in hearing more about the special discount you mentioned. Ideally, we would need up to 15% off orders of no more than 50 units. It would be great to discuss this soon. Kind Regards, James Mazur Focus on making shorter statements and addressing the main points only.