Stem immigration.
Accept that Islam is the problem.
Admit that Islam is the problem.
Regaurliy vocalize that Islam is the problem and make it clear that we despise many of the beliefs that even ordinary Muslims believe in. Hell, even run ad campaigns. Teach the truth about all religions in schools. I was taught Islam was a religion of peace, no mention of the atrocities in the quran, history, or present day Islam.
Teach our values at schools with pride and not shame.
Remove all faith schools, funding from Saudi Arabia and religion from prisons.
Do everything we can to support ex muslims and muslim reformists. Currently, even in Britain, to be an ex muslim who is critical of Islam requires you to hire a bodyguard whilst simultaenously being demonized by the left for not being accepting.
Accept the problem is still not going to go away for a long time.