I think the Warning occurs on Good Friday of either 2022 or 2023. Between now and then, I think the pandemic will continue to rage, and society will become worse and worse. The pandemic might possibly end by finding a good treatment or an effective vaccine — but if not, things will become really bad.
Of course, we know that the difference between finding a treatment/vaccine, or not, is mainly the result of prayer, self-denial, and works of mercy — acts done in cooperation with grace. If people respond to grace, then the pandemic will be less severe, and if they reject grace, it will be worse.
I expect another run on the supermarkets. People should have at least a month of food stored, if not 2 or 3. The usual advice that “preppers” give applies here. People need to be ready to rely on themselves and their family/friends/neighbors, rather than larger society or govt. Things are going to start falling apart. Also, store up medications, as these will be in short supply in the future.
Also during the next 2 or 3 years, things will get worse in the Middle East, with a new rise of Islamic extremism. Iran will announce they have nuclear weapons and the other extremists will flock to them.
Also, in the next year or so, the conservative schism will result in a full break of the papal accusers from the Pope and the body of Bishops. Remain faithful to the Pope, as to Christ himself, even if you do not always understand his teaching, which is His Teaching.