It helps to write down what the real problems are, why it is so difficult now. And then take a step back. Be pragmatic. Maybe some earlier decision was wrong a

It helps to write down what the real problems are, why it is so difficult now. And then take a step back. Be pragmatic. Maybe some earlier decision was wrong and needs to be changed, to simplify, to remove some of the goals, so that you can realistically finish something in a reasonable time (think about days, max 1-2 weeks), which is useful, and can be shown. Then later you can still extend it, and maybe work on some of the other goals.