Upvote:3
Whether you apply in London or Poland, your main problem remains: you lied on your previous application.
If the visa processing officers find out that you lied then your credibility is wrecked, your chances of getting a visa are negligible, and you could find yourself banned for a long time.
If you change your story about your job you will have to come up with a watertight explanation for the change in circumstances. This might be difficult after just six months.
I am not advocating that you lie again. Rather, if you leave another application until a couple of years have passed it's easier to account for having a good income that will draw you back to the UK.
If you must visit the USA it might pay to get advice from a competent immigration lawyer.