"...Should I still submit in case people would like to?"

Of course! That's the reason EVERYTHING gets submitted here; in case people would like to use it.

"...if people want to use it or modify it for commercial projects, so long as they attribute the original art to me? Is that right?"

Correct. CC-BY is very similar in this regard, but OGA-BY grants slightly greater freedom since it doesn't forbid platforms that use DRM, such as Apple App Store.

"Sorry for all the questions."

Two questions are hardly overwhelming. Ask more. :)

Some caveats to note: The answers to the following clarifying questions will change how you should go about submitting the art. 

• There is a distinction between the copyright (which you will be sharing with others) and the trademark of your (quasi?) O.C. character. Are you comfortable with people using that character, including any details you share about her? (such as name, personality, etc.) Or would you rather people only use the art of the character, but not the essence (name, personality, entity) of the character?
• "...Not *super* original...", does this mean the art is based on other artwork of other character(s) not originally created by you? i.e. fan art of Hatsune Miku. Or are you saying the artwork and character is entirely your own creation, but the concepts are not exactly revolutionary? i.e. "you've probably seen characters like this before."
• Were any AI tools used at any stage of the creation process? AI assisted artwork is not strictly forbidden, but it does change the information requirements and download rules when submitting the art.

Sounds good. Submit away!