Best Setting for High Quality live Stream Encoding with NVENC_HEVC

We are using Quadro RTX 4000 for live stream transcoding, with default settings

ffmpeg -v warning -hwaccel_device 0 -hwaccel cuda -hwaccel_output_format cuda -c:v h264_cuvid -deint 2 -drop_second_field 1\
-i udp:// -c:a libfdk_aac -b:a 128k -ar 48000 -c:v hevc_nvenc -b:v 4000k -g 25 -f mpegts udp://

Video Resolution : 1920x1080
Driver Version: 470.42.01 CUDA Version: 11.4
OS: Ubuntu 18.04
guide us to achieve best compression with high quality.

Thanks in advance