Recommended settings:

Steps: 20 -25

CFG scale: 3 - 5

Sampler: DPM++ 2M

Hires upscale: 1.5,

Hires steps: 20,

Denoising strength: 0.35~0.5

Positive Prompt

masterpiece,best quality, 4K 

Negative Prompt

bad quality,worst quality,worst detail,