I want the game smoother and more fluidity.
Are you a PC player? If so upgrading components of your PC is your best bet.
It's in the options, it was the first thing I turned on when my fps was 20-30 on 4kIf FSR is in the options then I would definitely recommend using it. Setting it to Quality will give you a nice boost, and if you need more then you can go to Balanced or Performance. In most cases in most games you won't need to go lower than balanced.
FSR also works regardless of which brand of graphics card you use.