Similar to goblin mode in dating you should 100% be yourself but only if you already have money and don't particularly need a given job. This works best when you already have a job.
You want the shitty PHB megacorps to reject you so you don't win to lose by getting a job you are going to hate.
It's a Tuesday. You crawl out of bed. You don't brush your teeth, you don't take a shower, you don't do your hair, you don't even really get dressed. You grab a piece of cake or a pretzel or something from the fridge, climb under a blanket in whatever room your TV is in, and binge Star Wars content for the next 5 hours. Your boyfriend watches a portion of this from the kitchen table, sipping his coffee. Goblin mode.
Goblin mode as a consultant is charging whatever high price will make you want to work on a project, not doing sales, only answering the phone when and for whom you want, and letting your work speak for itself.
You want the shitty PHB megacorps to reject you so you don't win to lose by getting a job you are going to hate.