An agent has given you personal feedback on your query, but it’s a no.
Do you resubmit?
It is very discouraging for an agent to give personal feedback to a writer, and then to receive a revised manuscript a week or two later. My initial impression is that it’s not enough time to revise, and you do not want to create agent fatigue.
If you are going to resubmit, take your time, come back after some months or even a year or more. Show that you’re taking the feedback seriously.