The Samsung S model mentioned is still slated to get updates from Samsung till 2028.
Regarding the Google Playstore please check the following:
Internet Connection is stable.
Clear Cache
Clear Data and reopen
If that doesn't work Clear your network settings and reconnect to your WiFi and see if that solves the issue. Please also check previous WiFi connections and remove the ones that are no longer being used it can slow down the Internet connection as they are fingerprints in your network.
