>If you really can work multiple jobs, just go freelance. Offer some consulting or whatever. You will earn more and have less stress than juggling multiple jobs.
You won't earn more. I've considered that at one point and most adverts on freelance sites like Upwork are written by people who are either clueless or downright insane. These people usually want you to create a completely new system from scratch using technologies of their choosing and the offers are like $8-$15 per hour or $800 for work that is supposed to take months to complete. Why would anyone want to agree to do that when apparently getting steady paychecks from multiple companies is an option?