"...do you have any advice of some serious opportunities to apply for Line training on A320?"
Get a job on an A320. They'll sort out your line training, reliably.
Stop trying to think of 'quick fix' short-cuts. Get a regional job on a turbo-prop and learn from the bottom up. Or become a flying instructor. Build up some real experience first and stop trying to be one of these impatient 'whipper-snappers' who wants everything NOW! You're only 25 for goodness sakes, you've got 40 years of career ahead of you. Take your time and do it properly. I've known many people who haven't even started their careers at your age and have progressed well by doing things properly. Things are slow now. Just accept it. Everyone is in the same boat. Be patient and do things properly and your turn will come.
Try short cuts and you're likely to get thoroughly ripped off!