First it is good that you are using your Dell OEM drivers for your laptop since they are 100% compatible with your laptop features.
Second your laptop AMD GPU is not supported with driver updates anymore so only Dell can update your AMD GPU card.
Third for the AMD GPU driver to work correctly all of your Intel Drivers especially the Graphics and CHIPSET drivers plus BIOS versions must be the latest and your Windows OS fully updated via Windows Update.
By the way, while playing the games with low FPS check the temperature of both your CPU and GPU in your laptop.
Possibly it is overheating and throttling or slowing down.
Make sure your laptop input/output vents are clean and you can feel air going in and out of the laptop.
You can download OCCT, I believe it is compatible with laptops, and run all three tests. See if your laptop crashes or starts to overheat.
NOTE: The reason why I mentioned the overheating issue is due to your laptop's age and probably thinking the CPU thermal paste has probably lost its efficiency in transferring heat away from your Intel CPU.