It was down to 16,000 new cases per day on April 19th and then jumped to 21000 for the next two days. How hard is this for you to grasp? Or is a 30% jump not "significant" where you come from? If your boss offered you a 30% pay rise, would you turn it down because it's "not significant"?
As much as I would love it to be a sign that it's continuing to drop, I would suggest the numbers on Tuesday after a full reporting day will still be around the 20,000 mark, hopefully not higher, and a sign that the bug is running out of people to infect.
As for your theory about weekends, no, the bug does not relax at weekends, it's just that there is less testing and less reporting.
Honestly, I struggle to understand what you think you are looking at.