I think I really messed up this time. I applied from UK as I found a new job with the same employer and my visa was expiring anyways (valid until 29 July). I messed up by not choosing priority or premium service (I know

My job starting date is 1st July. My application is still awaiting a decision. Is this going to be a problem?
What are my options? Can I convert the standard service to priority or premium now? Can I cancel, and send a new application now?
What if my application gets rejected after 29 July (which is the last day my current visa is valid)? A I going to be deported?
Any thoughts and helps are greatly appreciated.
Thanks
Ma