Yes, Murena can no longer support Android 9 (the P in your version number indicates you are on Android 9 “Pie”) and unfortunately you cannot upgrade to a higher version through the Updater in Settings (so-called “OTA Upgrade”). However, you can upgrade manually (most likely that would mean complete data loss though, so if you will upgrade manually, make a backup of everything that is precious to you before), even to Android 12 now. See official information here:
Your version number (the “dev” part) also suggests you did not buy your FP3 from Murena (e), but installed /e/ on it yourself, is that correct?