Travellator: there’s a huge amount of brinkmanship at play in such circumstances. Although the outlook is clearly far from positive, there is still the opportunity for the strike to be averted.
If the strikes do go ahead, then BA will announce a detailed commercial policy, the terms of which will allow you to make a considered judgment on how to proceed.
That judgment should be based on the fact that again, if a strike goes ahead, then aircraft will likely still be out of position and simply moving to the next day’s flight may not practically improve your position.
My personal advice: sit tight for the moment and keep a close eye on ba.com.