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It's PR within regions... you only need everyone to go vote and vote for Liberal Democrat.
That's it, that simple.
For UK elections it's more difficult, then it's first past the post on constituencies between 75-85k people and careful voting it needed.
But for EU PR based elections... you just need people to vote, and for EU voting Lib Dem is the strongest option if you do not want your vote construed as being for a pro-Brexit party (even Labour votes can be counted in that).
I lot of people I know are looking for guidance on how to vote tactically to prevent UKIP / Brexit Party getting lots of seats. We need a hero.