I like almost all of this, but I disagree with merging the Senate and House as well as a VAT on luxury items. We already have tax on basically every transaction and the burden is on the consumer, that needs to change. What should happen is that all taxes on food items currently should be removed. I believe the separation of Senate and House, while burdensome and inefficient at times, really does an essential good for American society. We would fare much better if we had term limits and more than two (essentially one) political party.
Edit: I want to continue with strickening the UBI from this list as well in exchange for significanly improving social services to make sure that everyone is guaranteed food, housing, medical, and security. I get that income is important and some people cant work, but inflation is real and that money has to come from somewhere not just the ether. It would be better to create/improve upon existing social safety nets to make sure everyone can contribute to society in some way rather than just giving everyone money for nothing.