When downloading, ensure you select the option to prevent blurring or distortion caused by improper scaling.
If you can't find the exact "vibe" you want, you can create a custom background:
Sites like GetWallpapers offer collections ranging from minimalist anime backgrounds to traditional ink wash paintings. Create Your Own
Platforms like Canva or Shutterstock Create have templates specifically set to 1920x1080.
Look for sites like WallpaperAccess or WallpaperCave which categorize high-res shots of Japanese gardens and pagodas.