How do I detox THC quickly? HELP!!!

So I’m seeking new employment and had to take a drug test. Considering I use a THC vape, I stopped using it 3 weeks prior to my test. All i drink is water and a lot of it. I bought a Detoxify brand drink. Using my test strips at home, it’s showed negative. I went to the laboratory for my official test and they told me that my urine was “too diluted” and that I would have to come back and test again. I returned four days later, but consumed a different brand of detox drink. Once again, they declared it “too diluted” and rescinded the job offer. I am devastated and desperate to start working. I went to a private lab on my own today and asked for a urine analysis. It showed positive for marijuana/THC. Does anyone have any tips on how to get this out of my system ASAP? The drinks never failed me before in the past but they are not helping me pass this time either. Any advice would be most appreciated. Thanks!