My 7 month long GMAT preparation journey seems to be at risk: Covid-19

So, my seven months of grueling, frustrating, and at times amazing journey of preparing for the GMAT was at the brink of completion. I had planned to take the GMAT on 25th March. All was set. I had just got done with working on the few topics I was weak at - listening to all those never-ending yet extremely helpful webinars, doing tens of questions on each topic, and reviewing each answer to its core. And, yet after all of this, I have come to realize that I will not be able to sit for the GMAT for at least a month! I can't complain because the humanity in its entirety is facing this scourge. We are all in this together, and by God's will, we will come out of it stronger.

The biggest point of concern for me right now is not knowing how to effectively manage so many days till I eventually am able to take the GMAT. By effectively manage what I mean is the right manner in which one could retain all that one has learnt and not get rusty till the test day. Let me explain. When you're preparing in a flow, whatever you have learnt is fresh and your memory can easily fetch whatever you have learnt. You are able to recognize patterns, something that makes the essence of the GMAT. Add to that, you're excited and prepared for the test day. You've been making your mind for a week or so about at last sitting in to go through the real thing. The anticipation is real. And, right when you are fully prepared mentally to take the test, you are told that you will not be able to take the test with no date limit in sight. You feel a huge void. What do I do with all this uncertainty? How do I manage so many days without losing my grip of the subtle concepts that I have tried to master for the seven months?

I've never taken the GMAT, but to me it's a war that I must conquer to prove my ability. It's a do or die in my case. Getting a 700+ is a need, less a want, for me. And I've pushed the boundaries of my quantitative and verbal reasoning inch by inch every day, like so many did before me. The "blood, sweat, and tears" I have given in this long and arduous journey appear to go down the drain should I not get clear on how must I manage the next few weeks of uncertainty and void.

Please help if you think you might guide me well. I'll truly appreciate.