My best advice for you is to keep an eye on polling for your constituency and vote for the best option to keep Reform out. In the Gorton & Denton by-election recently, the best tactical vote was for the Greens, despite Labour really pushing the narrative that they were the best option to keep Reform out. The reality is that there are a LOT of people who will vote to keep Labour out, too, since they've so badly betrayed a lot of their base.