I agree with earlier comments that the Conservatives will try to frame the next general election, at least in part as a referendum on immigration. But I don't think it will be successful, due to them repeatedly failing to meet their own targets, including since 2019 when they've had large working majorities.
Even if you ignore ethnics and only focus on practicality, the Tories have basically snookered themselves by setting completely unrealistic and undeliverable targets re cutting net migration. Regardless of whether you agree or disagree with a policy, clearly if there's no chance of it being delivered it shouldn't be pledged in the first place. They've done it, to appease right wing back-benchers, the right-wing media in the short-term, without thinking of what happens next. They anger many people on the left and centre of the political spectrum by making those promises and using that rhetoric, and then anger many people on the right of the political spectrum by failing to meet their pledged targets (and of those people on the left and centre that they previously angered are not going to forgive them).
Also Reform, including Farage, attacking the Tories on immigration from the right, will also be very damaging for them. It is of course clear that Reform want the Tories to suffer a heavy defeat, so that they can influence their next leadership election and 'rebuild' afterwards. Their previous Brexit Party incarnation clearly influenced the Tories ditching May and replacing him with Johnson in 2019.