I am not sure if fabricating something is a good idea. I wonder if you could capitalize on things you do well and something you know you can do well. I’d not describe things you either can’t do or might not be good at. I’d focus on things you do well. Put details of your last job describing what you actually did like content or what not. I am not sure why you say you have to lie? Lying might work short term but it’s not a good strategy long term. You could get a job but not be able to keep it. I do think you might want to omit being fired but maybe don’t lie about actual tasks you did?