OP, think I understand where you're coming from. It takes time to define what Achievement means to us - it means something different to everyone, and changes over time. Often achievers find that, sometime in midlife, their definitions of success were hubristic and they look inward and seek to redefine what success means to them. Though I've never craved greatness with a capital G, I always wanted to live an extra-ordinary life. To me, for many years, that involved taking financial and career risks to work on independent creative/philanthropic projects, and live where I wanted to. None of this involved working a 9-5 job at an office, saving a percentage of income, etc. At the time, I believed a low-risk life = mediocrity.
The careers or lifestyles most conducive to FIRE can seem stale compared to other, more adventurous options...10-15 years of working in the same job, or the same city, with the same commute. Posters here tend to disparage risk-taking by the young, in favor of looking at the long-term benefits of compound interest. A waiting until FI attitude for life to begin which can be unfortunate (but those with kids have responsibilities larger than their personal desires). After 'finding' MMM a couple of years ago, I eventually decided to commit full-time to an arts job which ticked a number of boxes, and got serious about building my stache and investments. This stability has been good for other areas of my life as well.
We want different things at different stages of life. You sound like perhaps you're in your 20s/early 30s, so would need to save less to have that retirement cushion than the geezers (like me) in their 40s+. You could save a smallish stash, lock it away in low-fee, tax-deferred investments for 20+ years, save another stash to start your businesses, and take things from there. Entrepreneurialism is by nature fraught with risk. Perhaps you have the right personality to become an entrepreneur, or perhaps something else. We never know how successful we can be till we try. You might sell those businesses for millions and/or change the world. But, if not, someday you'd still have that stache.