IB midlife crisis at 23… please help

Congrats on the offer, great to be in good-standing with your bank in this market.

While it might not be an obvious answer, the question is a really simple trade-off.  Do you value the money or your sanity?

I have no judgement on anyone making the decision one way or the other, it's simply something you'll have to figure out for yourself.  I won't try to influence you to either option, but I will say that when I was faced with this choice I chose to leave.

There are a few factors that I can pinpoint, and with the benefit of hindsight, that led me to the decision:

• I didn't love banking.  I loved the idea of it, I loved that I was able to break-in, I loved the cache of being a banker, but I'm very happy and proud to have stuck it out as long as I did.  In other words, I felt like I had "checked the box" strengthened my resume and overall profile.  
• At the time, I did not have the experience and maturity to navigate a high stress job like that.  I was so focused on not fucking up and making my bosses happy that I let the job eat me alive mentally/emotionally.  While that's not uncommon, it's definitely something that is unique to the individual.  It is already a demanding position and if you, personally, can't create a separation then you'll completely drive yourself mad and burnout.  Others weren't headcases and were able to work hard and still find a balance, or check out at times.  I couldn't do that at the time and realized it was completely unsustainable to be in that environment.
• I never had money and wasn't living beyond my means.  Obviously a big one to consider.  I cut my comp in half at 26 years old and didn't have to change much about my lifestyle.  Of course that is real money I was walking away from, but I was still able to live comfortably financially and the overall quality of my life was priceless.
• The job I ended up leaving for was one that I felt extremely positive about.  Another massive one.  As miserable as I was, I was really focused on making sure when I left I was "running to" something and not "running from" something.  Paycut aside, I felt great about the long-term prospects, career progression, and folks I would be working with.  Years later I still do.
• Reclaiming of balance.  I have a bunch of hobbies and I'm the happiest person in the world when I get to do them.  All of which were taking a massive backseat during the banking stint and it just compounded how shitty I felt about my situation.  I still work hard, but I have so much more time to pursue my hobbies, which means a lot to me.
• Friends.  I'm fortunate to have a great group of friends, many of which live close to me.  When I was in banking I was almost never available or when I did have free time just wanted to lay around or sleep.  After so many times responding to hangout plans with "sorry guys, can't this weekend" or "tied up with work" eventually those texts stop coming.  This was probably played up in my head, but the thought of losing touch with my core group of friends for a job that I hate stopped becoming acceptable
• Girlfriend now fiance.  Never ever felt any pressure about the hours from her, but same thing with the friends, I was worried that eventually it would drive a wedge between us.  After a while, how can you not grow to resent someone that isn't able to commit to a weekend trip or simple dinner plans?  What an eye-opener it was during COVID WFH when she had to watch me roll out of bed exhausted, sit on the computer in the living room for 18 hours, go-to-bed 3-5 hours after her, on repeat for months.

Anyway, there is probably other points I'm forgetting but those were some of the key things that drove my decision and maybe it will help you think through yours.  Be thoughtful but don't kill yourself overthinking it.  You're 23 with a massive career in front of you.  Good luck