Did they? If they did, then they did a terrible job of it, since many people didn’t hear that message. The message that everyone heard over and over again is “I’m not trump”. Besides, promising to get rid of student loans as a campaign promise when you just spent 4 years proving that you can’t really deliver on that promise seems unwise.
They did and it was loud and clear and everyone I know that voted republican did so because they thought democrats were bad for the economy and polls showed that.
You’re scapegoating democrats for not doing enough when really there just wasn’t enough voters that supported them because of right wing propaganda.