I like your sentiment, but, it does not matter how many individuals are in favour, unless and until we get a Government who wish to join, it will not happen. At present, the only viable alternatives for Government are Labour or Conservative, neither have rejoining as a policy, or, even a desire. It's not going to happen, sadly.
There are two excellent historical examples where a faction has taken control of a minority which has formed a tail which has wagged the dog:
Prohibition in the USA:
Nazism in Germany:
1933–1945 (12 years)
Brexit occurred in exactly the same way with a faction taking control of a minority which formed a tail which wagged the dog. So let us give it 13 years maximum and, with a bit of persistence from joiners, possibly considerably less. Once there are votes in joining, the political parties will develop policy accordingly.
As a footnote, it is interesting to see that the US state whose vote tipped the balance against Prohibition to bring it to an end was Mormon, teetotal, Utah. There is wisdom and reason in some surprising places. Keep the faith!