a lot of you guys are missing the scheme here... you don't finesse your entire career, you finesse the first step. i have done basically the same exact thing, but a little different
step 1. you oversell your way into a job. for me it was network engineering. for this guy, it was advertising.
this will be your hardest step... getting yourself a job, you do not deserve, and you're not qualified. you might have to flat out make shyt up.. you might just sprinkle a few lies in there.. you might do a lot of things.. but finesse that job
step 2. stay above water as long as you can. learn everything you can. network as much as you can.
you don't know when you're gonna be found out. might be never (me)... might be 4 months (OP).... but this step is most important
step 3. use the job you finessed, to get a better job..
you used to be liar... didn't know shyt about your job, lied to get in, blah blah blah... well after a few months, well now you have an official title in your field AND experience. now you're not lying in your next interviews. maybe about why you got fired, but that's if you got fired. you might be smart enough to last a year, bounce before you get caught, and be able to move up and out to another company
step 4. repeat step 3, unlimited amount of times, forever...
now you got the REAL jobs, real experience, and real money... enjoy.... nobody is going to check up on your 5th job ago... or the first job you ever lied to... the last job they check thinks you're great, and that's even if they check... cause they can clearly see that you been steady working in the field for 5-10 years now
i been in mine 4 now.... network engineer... nikka never took a computer class in my life... but 4 years experience, plenty of people to drop references, a great title, and they will never call up my first job..... which was working on installing cable (fiber optic inspector for network communications company) and ask them what i really did there