Sprite edge is not smooth

Hello.
A have a sprite with a side which size is not equals to a power of two.
Unity does it’s edges not smooth. For ETC compression it needs to be a power of two.
Which is the right decision/solution to fix?
I don’t have designer skills.

Tags: power of two, not a designer, KISS, Unity 2019.3.

You could open it in any image editing program and change the size to be a power of two. The closest power of two is 1024x1024. You also combine it into a Sprite Atlas.