If you have an old phone that only officially supports software up to Android 11, there's nothing you could do. The best option is for you to buy a new phone. But there is an option for you to update it to Android 12 and further, you could try custom roms though not recommended as it is a tough process and could also brick your phone and void the warranty and support from samsung, If done correctly you could land yourself a brand new and fluid software experience.
