There will almost definitely be more cases after Purim, but in places where many are already vaccinated it won't be anywhere near as bad. One of the biggest problems last year was the issue of disbelief - it was still very new, and noone believed that it could get so out of hand. Now people are more aware, and most are taking some sort of precautions. Even in the groups that refuse to mask etc., many of them already had covid, so that immunity will factor in as well.