What should I do about a bad decision I made?
What lead you to these bad decisions?
I had some bad practices that lead to bad results.
You should try to figure out what these bad practices are. Figuring that out will stop you from making bad decision in the future.
I guess I can try doing that.
It's good to avoid making bad decisions if you are aware that something is not the right choice. This will prevent you from having regret about your choices later.