there is worldwide shipping disruption from covid (obviously). air traffic, which moves a lot of mail, has been seriously impacted. USPS is using ships for mail service, causing delays.
some countries shut down their international shipping, at least short-term. i tried to order something from Poland, seller canceled the order because at the time he was unable to ship outside of Poland.
many countries still have shipping restrictions, both incoming and outgoing.
i, personally, at least for the immediate future, will not be shipping anything internationally, which impacts my business significantly. however, since all this has begun, i have had three international shipping problems, where i had not had that many problems (total) in the last decade or more. it's not worth my time or hassle, or loss of money from refund claims.
that said, shipping from some countries and through some couriers, does not seem to be impacted as much as postal services.
patience is key, or just don't order things from other countries right now.

check the USPS website for current conditions and restrictions. they seem to be fairly accurate as to what is going on with shipping to and from other countries.
https://faq.usps.com/s/article/USPS-...tial-Customers
https://faq.usps.com/s/article/Mail-...ts-and-Updates