Depending on your specific device and how much you like to tinker, there are three main contenders: 1. ArkOS (The Power User's Choice)
Because the RK3326 is widely used in handhelds like the Anbernic RG351 series and the Powkiddy RGB10 , several custom firmware (CFW) projects have matured to offer better performance and features than stock software: rk3326 firmware
Which are you currently using, so I can point you to the specific download page for your device? Depending on your specific device and how much