Aspiration reset?

Hello.
I am sorry but I don't think that you can reset a completed aspiration. You would need to start a new save game file and then place a version of your sim in it before he/she has done the aspiration. If you save your current sim to your library, they will still keep their aspiration progress when placing in a new game.

Thank you for the response. I have saved a Sim with completed aspiration, but she lost her aspiration trait when I placed her in a new game. But I have figured out I can use a trait cheat to bring her deserved aspiration trait back again.

Hello.
This is a link to a list of the cheat codes that you can use to restore the missing aspiration trait. You probably already have found the cheat codes but I will post them just in case may help you or other simmers reading your thread.
http://sims-online.com/sims-4-trait-cheats-codes-expansions/

I created a twin sibling of my character, put her outfits back and erased the first one. That's called cloning. Now, I feel bad about what I did.