There can be many causes of stuttering, even with good hardware. I will go over some of the most common causes.
You want to disable all power saving features in the BIOS, within Windows, and within the GPU driver. You can do this by disabling C-States in the BIOS, locking the CPU clock speed to its maximum and using a constant voltage in the BIOS, setting Windows to the maximum power plan, setting the GPU to "prefer maximum performance" in the NVIDIA Control Panel, and using MSI Afterburner to lock GPU clock speeds to their maximum at all times.
Check your startup programs. Disable anything you don't use/need. Check the services running in the background. Terminate as many as you can and change them to "manual" mode to prevent them from automatically starting. Some of the absolute worst offenders are any RGB software, monitoring software, and antivirus programs. You can also enable game mode on your PC to see if that helps.
Other Poor Settings:
Try to use hardware-accelerated GPU scheduling. Make sure your game is running at lower settings. I would never recommend using the NVIDIA optimizer like you have used. Disable that and manually set your settings to your native resolution and much lower. For reference, I play games at low/medium settings for maximum FPS and smoothness even on my i9 13900K and RTX 4090.
Hardware is not as good as you think it is:
The i7 4770K and GTX 1070 are not bad parts necessarily, but they are definitely very weak heading into 2023. My guess is that your CPU is simply not powerful enough for a smooth experience in a large battle royale game with its low clock speeds and instructions per clock. Also, how is your RAM configured? Slow DDR3 is not doing you any favors in terms of getting a smooth experience.