Getting in contact with soc-dem/eurocommunists, for the first time, I see 😅 I'm from Latin America, living in Portugal and we hear some very similar speeches around here. To get theory about that, I'd suggest you get into Lenin's critique of Kautsky and/or Hoxha's critique of Eurocommunism.

Now, about the problem at hand. Since you're in Britain, I think there's little to be done regarding raising class consciousness of people in Gaza/Israel and little to be done regarding directly stopping the bombs. For me, this sounds like a very idealistic view.

You guys need to do what's at hand: the banning the of the Israeli soccer fans is pretty good. Also is attending all pro-Palestinians demonstrations that happen near you, distributing leaflets, speaking for the masses in Britain and raising class consciousness around English people so that they pressure their own State on cutting ties with this genocidal state. The general strike in Italy is a good goal to promote, in my opinion.

And in this process, you will gather more people to fight the same fight, towards the final goal which is ending capitalism, the regime that allow genocides like that to happen.