Converting design into pixel perfect?

[kgbf]

Hey all. I have two designs that I'm realizing AREN'T pixel perfect (attached). On another thread, I discovered this awesome post on how to CREATE pixel perfect designs, but I'm wondering what a person should do if they already have an established design that they'd like to FIX.

Could anybody help me out? Does that guide exist? I'm especially feeling urgent about the tree trio (again, attached).

Thanks in advance!

[kgbf]

Also, to follow up, I found these instructions for aligning already existing objects with the pixel grid.

https://helpx.adobe.com/illustrator/using/pixel-perfect.html

It's been super helpful, but it hasn't helped at all with the diagonal lines within my Christmas tree shapes. How do you make diagonal lines pixel perfect?!

[Monika Gause]

Please post screenshots of what you want to adjust.

The original files don't help with this.