How to save democracy/"the west" from voters who hate immigrants (esp. Muslims)?

I believe a huge reason for the current right-wing populism (Le Pen, Wilders, Trump, Brexit, AfD, Eastern Europe, etc) is immigration. Especially Muslim immigration and refugees.

The populism appears to be fuelled by fears that:
- Some percentage of Muslims are terrorists
- A larger percentage of Muslims don't share "our values"
- Refugees and Muslims are a net negative for the finanical situation of our societies
- Increasingly, I see "identity" reasons like "white identity is under attack", "soon Europe will be like Africa", "When I walk on the streets, I see 50 foreigners before I see 1 German citizen [apparently you can determine who's a German citizen simply by looking at people] in my home city", etc.

And it seems like more and more voters base their voting decision on which candidate/party is most likely to stop immigration. It's their #1 issue. Economic policies, social policies, enviromental policies? Doesn't matter! Just keep those Muslims out! Some even seem to rebase their political views so they share the economic, social, etc. views with their favourite "Muslim ban" party.

This is very alarming, because many Muslim-hate parties also attack other "western values" like womens rights, LGBTQ rights, seeking good relations with other nations, freedom of the press, freedom of speech and opinion, etc. Some voters are apparently happy to throw those out of the window to get Muslim bans.

Even in the Ossoff race, I've seen tweets where some twitter users claimed that if Ossoff wins, he will somehow bring lots of immigrants to GA06. A recent poll in the EU shows 55% in favour of a Muslim immigration ban. Even in Germany, where many mainstream media outlets often publish opinion pieces in favour of immigration, 53% agreed that we need a Muslim ban.

I'm so worried about the future of "the west" and especially liberal (as in liberty) values. I've almost given up on true left-wing policies already, but what about moderate right-leaning politics? Is there a way to keep those, or will the reactionaries soon take over because Muslim-haters vote them into office? Is there anything we can do to prevent this from happening?