Quite a few posts there so I'll try to make a reply that covers the points made.
First off we need to remember that immigration is a net benefit to the UK economy and always has been, with immigrants putting more into the UK economy than they take out (which contrasts sharply with the 'native' population, who take out more than they put in overall).
There is certainly a conversation to be had about the mass importation of cheap labour, but remember it's always been within the UK government's power to fix that with higher minimum wages, strong workplace contracts, anti-exploitation laws and suchlike, the EU has nothing to do with that, the UK government could have done that when we were an EU member.
In terms of the societal structures to support this increase in population, yes of course we need to make sure those are in place and functional, but on that we must remember that the Tory austerity years stripped public services to the bone, they ransacked local council budgets and adopted a scorched earth approach to public finances, all predicated on the lie that 'the nation's credit card was maxed out', so working people got it in the neck year after year, whilst the rich made out like bandits. (No austerity for for David, George and their mates!) So now we have the likes of Priti Patel boasting about all the new police officers they're recruiting, whilst failing to mention that even if they recruit the numbers they say they will (unlikely), we'll still be below the numbers we had when they came into office back in 2010.
I'm not wildly impressed with Keir Starmer's Labour Party, he's repaired a lot of the damage of the Corbyn era and has at least made the Labour Party look electable (I rather liked Corbyn and thought the last election manifesto he ran on was very impressive, but I recognise he was an electoral liability in many areas). However, in terms of a clear vision for how they're going to fix things, Labour are being far too timid, but I am mindful that the right wing attack media in this country, largely owned by, and run for the convenience of billionaires - are looking for any opportunity to start screaming about, for example, 'BREXIT BETRAYAL'.
The next general election is still a couple of years out, as Napoleon said, 'Never interrupt your enemy when he is in the process of making a mistake', and with the Tories apparently determined to self-immolate on a biblical scale at the moment, one can understand Labour sitting back and letting them crack on with it, but we're going to need some clear and determined policy announcements before too long.
A point I made earlier in this thread, probably back in 2019, so long before we were actually out of the EU and transition, was that a lot of the stuff people were angry about and cited as their reason for voting for Leave, wasn't going to be fixed by the UK leaving the EU, because they were UK problems that were within the power of the UK government to fix, it just didn't want to. The extent to which the UK was 'UNDER EU CONTROL' was always massively overstated (to this day I've never met anyone who can actually name 'An EU rule' they specifically wanted to get rid of, it's always just 'all them EU rules innit') - what we had was an awful decade of Tory rule (variously propped up by the Lib Dems and DUP), and people were justifiably angry with how shit a lot of stuff had got, the problem was they blamed the EU, when the real culprits were sat in Downing Street.
And here we are in the year 2022, with what is probably the worst government the UK has ever had, headed up by the worst Prime Minister we've ever had, we're out of the EU and guess what, it didn't fix anything. Nothing magically got better when we left the EU, because all the shit that's fucked up in the UK isn't the EU's fault, it never was, Brexit got done*, and it didn't do anything.
* I mean, sort of, Johnson's deal was so tragi-comedically bad that we'll be suffering its negative effects for years, if not decades to come.