The new variants and increase in covid cases in the US and abroad are not surprising.
I'm thinking that the newer variants and their spread are likely a result of China dropping all of its covid restrictions in December, 2022.
After the initial covid infections in 2019 in China, the Chinese government imposed draconian control methods in a "zero covid policy." They forced isolation of infected people in groups at special housing for them. Consequently, a large part of the population was not exposed to covid. In addition, China refused the RNA vaccines and created their own, which is not as effective.
As protests against the isolation methods grew, China abruptly dropped all requirements for mandatory isolation and other restrictions. By January of this year, covid cases in China soared, causing deaths and hospitalizations like the rest of the world had in 2020.
https://publichealth.jhu.edu/2023/no-more-lockdowns-chinas-new-covid-landscape#:~:text=After%20three%20years%20of%20implementing,to%20address%20the%20current%20surge.
With all those newly infected people and business interactions and travel into and out of China, new variations and a rise in infections outside of China were inevitable.
It will probably not get as bad as 2020 here in the US. Vaccines and previous infections have decreased the susceptibility for most people here.
But those of us who are seniors and everyone who has an underlying health condition will need to be extra cautious, as if it were 2020 again.