If your only tool is a hammer, every issue looks like a nail. If you only think of politics through the lense of electoralism, you'll believe such ridiculous things like a need to back the greens because anything else splits the vote.
Which historic changes have been achieved in parliament? None. They were enacted by a parliament, but fought for by mass organizing and in protest on the streets. The best long term alternative I see to the Tories, Labour, and even Reform, is grassroots community organizing, which is the goal of Your Party.
Emancipating people, showing them how they can fight for themselves, instead of carrying the faulty belief that we need representatives to fight for us.