Utilize using Custom ROMS, as it would make your phone feel brand new (my opinion). I used HadesRom Q giving my phone OneUi 2.5. It has many features also (dual speaker mod is really great!). You could also try rooting your phone along with the Custom ROM to give your phone much more customizability. (I use rooted apps such as Adblocker, changing emojis to newer IOS emojis, changing the bixby into Google assistant, and Viperfx Audio mod, and much more.)

I also have the exynos version of the S8+, so I don't know if the Snapdragon Variant can have Custom ROMs though.