One viable option
Honestly, you've got exactly one viable option at this point:
That's it. Anything else, and welcome to your new third world economy. Britain will not recover from it for a very long time.
So suck it up, stop persisting in this foolishness, and start calling your MPs to let them know that remaining in the EU is the only choice you really have. Remind them that it was a non-binding referendum, remind them that it was damn near 50-50 anyway, remind them that the election was heavily influenced by the same Russian meddling that got the US the current Cheeto in office, and remind them that the British economy is toast if they don't give up on the ludicrous idea of leaving the EU.