Unity's Sprite Packer or Manually Creating Atlas?

I had the idea that textures should be all in one atlas, however I didn't knew I could do it with Sprite Packer, so from the start I have arranged all my textures manually in one big 2048 x 2048 image.

Any advice? Should I keep using the atlas or reexport my textures into individual files?

Also, I realized I could use the sprite packer on my 2048 atlas as well, I'm not really sure if it helps to optimize or worse, take up unnecessary space.