Like what Cherroy shared, FI (Financial Independence) is the core component, RE.. hm.. things may change when U reach FI or reaching FI.
During my days, no such acronym, FIRE. Just focused on FI thus have options - option to continue working current job/Co., to change to another Co., to change entirely to another field that is more in-line with one's "purpose", no more "cold sweat middle-of-night awakening" due to monetary worries, etc.
Thus, if RE means freedom of options, FIRE has been around for ages, though known as a different thing

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Sharing:
1. Financial independence/freedom (FF)
a. Personally, I was supposed to be FF in my 40s (now late 40s) but life happens - divorce, complicated birth, children, etc. Now, pushing it back to 50s to ensure children's education option.
b. I know the numbers needed - looks scary at first but do-able as we keep our focus, live below means (also good for planet, less destruction/wastage) & keep on growing investment assets.
c. I save 100% of my investment returns + at least 20% of my net income (excluding EPF/CPF), + IF there's bonus, >=50% is saved for investments & remaining is gifted & used for "feel good".
2. Man-at-work Vs Man-avoiding-work
Maybe i'm lucky, i enjoy what i do +i get paid well enough to be able to save & invest. Not many enjoy what they do, thus they just focus on "getting out" - which should not be the case. If U do not like the Co., then move. If U do not like your field, then learn other fields while working - suffer the 80% to get to the 20% of cheese/dream.
3. Ignore the noise
Be CRYSTAL CLEAR on what U want, ignore others - it's your life. When you're crystal, U literally just smile at "others' good intention/advice" - they aren't U, they can say/feel/opine whatever.
Just like Ramjade, loads of friends/colleagues/relatives will say things like:
a. What - U eating that again? Every day, how can U tahan?
b. Why U buy local car lar - U can afford ****
c. Eh, buy together lar holiday home - together gether cheaper, worth it la..
etc.
BTW, most of these folks.. they are the ones complaining not enough $ lar, blame employer for not paying earlier during Raya/CNY/Christmas la, blame Gov for too much tax lar, this lar, that lar

Also, most of these folks are either overweight or not able to do body-weight excercises - telling me to eat better

Apologies for the wall of text - just sharing my FIDO (Financial Independence, Doing Options) for U to convert to better FIRE.
Exactly.
Priority work towards FI and choose on RE later.
RE is still relevant just its up to individual to choose and live their post-FIRE.