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If you voted remain, you should cast you vote for Lib Dem.
They are the only 'credible' party to support staying in the EU.I'd love to vote green.
skinny-
Well, I suppose that's technically true, but the Lib Dems alone are not going to win a majority, so it will be necessary to join forces with others. And in choosing others, it makes sense to go for the least worst option. As the Tories are the worst option (for many) then they can be ruled out. That mostly leaves Labour, and, in a few instances, Green.
In other words, in a constituency where Lib Dems cannot win, but there is a strong chance that the Tories would win, then a vote for Labour would make tactical sense. That will hold back the Tory majority, and give a chance to another non-Tory (in this instance Labour) to contribute to the debate.
In my own constituency (Battersea), the Tories are dominant, with Labour not too far behind, and the Lib Dems a long way behind. There's no point in voting for the Lib Dems as my vote would almost certainly count for nothing where it matters (i.e. in the constituency itself to choose my MP).
boristrump
If you do look at the vote in terms of Brexit - rather than party - then you could say this:
You're either voting for what is (in effect) the status quo OR something/anything else. Whatever that alternative happens to be arguably doesn't matter. But that will be a difficult step for some (especially those who have reason to dislike particular parties).