Thanks for replying so quickly.
The email mentioned: You are ready, willing, and able to travel before the current expiry date of your medical exams, in your case, April 11, 2021. This validity may not be further extended, without you re-doing all immigration medical exam(s) and covering the cost for them
I guess I just want to be assured that if I don't reply but happy to re-do my medical exam and pass it, I will be extended for sure? I think i will be ready by May to deal with my property and belongings etc.