You have to believe it is possible to make it happen. Kudos to you for challenging the “standard” FIRE path which tells us to focus on saving rates.
One shall keep in mind that 5M in 20 or 30y may be worth less of today money, so you should aim higher and get there asap (I am half joking). You will need to do things differently than 99% of the population and accept risks to get the reward.
That reminds me of MJ DeMarco books, where he depicts three ways of living:
the sidewalk (you buy more than you earn and end up owing money to others).
the slowlane (you save and get rich old, you can cut the time by few decades by following FIRE ideas).
the fastlane aka “FatFIRE young” (you use entrepreneurship, which the books are about, to reach few millions in less than X years, while failing a few times first unless you’re talented and lucky).
The books suggest to pick a job that pays the bills, doesn’t take your time and energy while allowing you to work on your business idea. If you have a family it may be hard to sell them a lifestyle downgrade.
If you prefer to stay an employee, working at a tech company or quant firm in the US/CH is no doubt a good idea too if you can climb the ladder at the former or just get hired by the latter.
Check teamblind for compensation examples in US.
Tell us which path you pick and how it goes.