You should be able to receive another offer in the main round (if you're eligible/competitive enough for a course).....but have you changed your preferences?
You would need to have moved the main round course from your 2nd preference to your 1st preference. If you change your preference, you will be reconsidered in that main round. And then if you do get accepted to that course....you will have 2 offers to choose from.
And the 28 Feb enrollment date, like that does seem a bit far away? Not sure if there's an earlier offer-acceptance date....