It's hard - or impossible - to get
tobacco flavors correct in an
e-liquid. You can get hints of the flavor but in the end it isn't a direct equivalent, and some fans of any specific brand will like or dislike the result of a try at reproducing it.
The best way to approach this is to think of it as a new brand with many variations. Your old brand has gone under, and you need to find a replacement. It's just that if you can only accept a close version of your old brand then you are going to be disappointed.
Get a ton of different
tobacco-style liquid samplers from different suppliers, and also get some concentrated flavors. By trial and error you'll find something you like. It's far easier to reproduce the smoother, rounder flavors of US cigarettes than the sharp, acid taste of UK cigarettes (might be the difference between flue cured and air cured tobaccos, not sure). Sorry but I haven't tried Canada cigs.
There is a sort of tobacco-like flavor that is very popular with vapers, called RY4. It was originally invented by Ruyan as their #4 blend, hence the name. It is a smooth, rich flavor with tobacco, caramel and vanilla tones. It's really nothing like any real tobacco but nevertheless it presents an e-cigarette well - a new kind of tobacco flavor. There are lots of RY4 variations to try.
Also remember that what you like, someone else will hate. What they like, you will detest. It's just the way it is - you have to try stuff yourself. In matters of taste, advice is useless.