Unite to remain - Impossible?
Start explaining the good of the EU such as workers rights and environmental protection while we know powerful eurosceptics hate the EU because the EU tries to protect ordinary people against powerful multinationals, investment bankers and their politicians who want more profits and this supported by a tabloid press instead of always confirming that the EU will hurt the UK so it is seen as the enemy and not as a friend. And yes, the EU needs further improvements such as open debates between lobbyists and the EU although it is already very open in its decisions and show examples such as a link to the European Medicine Agency although suggestions can be made how to further improve these websites to make it even more citizen friendly because openness is the key against conspiracy theories. Indeed, many people consider the EU Commission as part of powerful companies and the handling of the financial crisis or the appointment of Mr Juncker's successor didn't increase confidence as people see those responsible for the crisis are now even gaining more power. Further, people working at the EU should receive more normal wages to restore trust in them, including paying taxes instead of enforcing austerity on others, mainly on ordinary people. Finally, out will indeed costs more with less power when the UK wants to remain part of certain EU agencies such as on international criminality but it is unlikely to stop trade. Afterwards a new referendum can be organised that may be won but only when the British start to like the EU and not only to have power.
Another possibility is to offer the EU presidency to PM Johnson, I think he may accept but at a large cost for the EU. Indeed, he may try to implement a neoliberalism throughout the EU although the EU parliament may try to block this; indeed, the three powers that control each other.