Dear (Name of the landlord) sir,
With the help of this small letter, I want to request you do not increase my rent this year. because of the accident that happened last month. I lost my ability to walk for this whole year and because of this, I am not able to do all the work of my office with my full efficiency. Because I am unable to work, my boss has decreased my salary to half. This year I was expecting a hike in my salary but instead of it, my salary got reduced. I know I have promised you to pay an increased amount of rent this year. Because of my bad circumstances, I am very sorry to tell you that I will not be able to pay you the increasing amount of rent this year.
I want you to understand my problem and help me to get over this time. This is a really very hard time for me and I am feeling very embarrassed about requesting you not to increase my rent. I know you are a very kind-hearted person and since I lost my ability to use my legs you helped me a lot. You are a true example of humanity.
I enjoy living here very much. I know my financial situation will be going to improve after some time. I am trying my best to get myself back to work. I am going to physiotherapy sessions every day to get myself fit as soon as possible. I hope that you could understand and please let me know your thoughts. If you wish to discuss this further, do not hesitate to reach out.
(name of the person)