The PlayStation Store for PlayStation Vita was discontinued on August 27, 2021. This means that you can no longer purchase new games or add-ons for the Vita from the PlayStation Store.
However, you can still download and play games that you have already purchased. You can also still use the PlayStation Store to redeem gift cards and vouchers.
The discontinuation of the PlayStation Store for PlayStation Vita was due to a number of factors, including the declining popularity of the Vita and the increasing popularity of mobile gaming.
Sony has said that they are committed to supporting the Vita and that they will continue to release firmware updates and security patches for the system. However, they have not said if they will ever bring the PlayStation Store back to the Vita.
If you are still a fan of the PlayStation Vita, recommend buying physical copies of games so that you can still play them even after the PlayStation Store is discontinued.