Let's try this another way.
You don't have to say anything about the positive benefits of brexit. None!
Just put some links up ?
Or, state, honestly, that No Deal, will result in financial, and trade, benefits for the country and its people, because.........
Or don't provide any links and don't make that statement? The choice is yours. Let's wait and see?
Personally i think most brexiteers thought the referendum was an immigration questionnaire and responded accordingly. Just admit that maybe? You are so fed up with immigrants that you will accept an uncertain, and almost certainly poorer future (the forseeable future), rather than the opposite that might mean continued immigration.
And before you assume incorrectly. There is a problem with immigration, but brexit will not cure it.