To put it bluntly, there are no guarantees of anything after qualification. some do get jobs flying large jet a/c straight out of training, but there are many more who do not. Search on my username and you will see plenty of replies to similar questions in previous postings.
The bottom line is, if you really want to do it you have to give it everything, apply to everyone again and again, take anything you can get, but IMHO keep building hours in any way, on anything as you do not look more desireable to an airline 1 year after qualification with the same number of hours that you had 1 year earlier. It doesn't get any easier with issue of a shiny CPL/IR.
Good luck, whatever you decide.
PP