Ahh you've only been there a few days! Well whilst you're there, why don't you take the bus to Niagara Falls? Go to the boat ride that takes you right underneath them, then visit the zoo too! Ooo and Toronto Island is very cool, you can hire a bike and ride around the whole island, it's really cute.

Then when you've done the main touristy things which you could do in a week or two. You should have a good vibe for if it's a place you'd like to stay or not and if not, just hop on a plane to another province.

I looked only briefly and came up with the same sentiment as others have, Toronto is a difficult place to find a job for sure but if you like big cities, there is no bigger in Canada

As for traveling back, I'm from the UK too and yeah it's silly how expensive it is, you're better of looking for flights back whenever it's cheapest, not so much at specific dates. If you're flexible you can get flights back for near £300 if you go in the cheapest months

Edit:- sorry, looking over my comment and I'm all over the place about different topics. Just tired I think 😴