First of all. Don't lose hope.
If you prepare for x, there is a good chance you will succeed with x-y. How about trying to prepare for x+100 as your score. I am sure if set that as your target, you 'll exceed at least x.
So, lets start by setting your target at 550 or perhaps 600.
If you are struggling with Verbal, have you identified where you are making mistakes most? Is it across all three areas or perhaps just with SC or CR or RC? If the later is the case, then there is a good chance that you can overcome this hurdle with some strategic, focused preparation.
I understand your decision not to spend any more time and money on GMAT. But, I encourage you to reconsider your decision. This site is a great resource and there are lot of fellow members who are willing and eager to help you.