I've been reading Bogleheads.org and other retirement resources diligently - so thanks to all in advance and appreciate any and all feedback.
For context, recent college grad in a solid field with reasonable room for growth. I've run a business in the last two years of college, as well as saving/investing diligently from part-time jobs, tutoring, internships, etc. I've always been interested in investing/retirement planning/FIRE, and I've done what I feel like is a lot of research in the area. However, I'm currently at a crossroads for how much risk to take, and where to take it, given I'm interested in retiring early.
PORTFOLIO INFO:
Emergency funds: Yes (~6 mons expenses, but I live at home so very minimal)
Debt: None
Tax Filing Status: Single (w/ pass-thru LLC side biz)
Tax Rate: 22%+ Federal (depends on business volume)
State of Residence: TX
Age: 22
Current retirement assets:
Current Asset allocation: 100% stocks / 0% bonds
Current International allocation: 30% of stocks
Taxable Brokerages: $60k (~equal in FNILX, FZILX, FZROX)
Roth IRAs: $60k (80% in FNILX/FZROX/FZILX) (rolled over a Roth 401k from an internship)
Cash: ~$15k-$20k in Chase (commingled funds for my business, working on better segregation)
Contributions:
$7k Roth IRA match (been maxing for a couple years)
$23.5k to Trad 401k (~5k match, depends on bonus)
~$41k to After-Tax 401k (Plan allows for MBR)
Questions
1. Is it wise to contribute so much to a MBR at such a young age, are there any potential downsides? My expenses are very low, and my side-hustle income is sufficient for my wants/needs for now.
2. I'm unsure of whether I want to continue working or try to retire early, so should 401k contributions be split between trad/Roth?
3. In terms of allocation, if I'm targeting an early retirement ~15 years from now, should I be buying target date 2040 funds, or is remaining 100% in equities worthwhile? I believe I can stomach a 30%+ drop in portfolio value, but not sure.
Additionally, if anyone has advice on whether pursuing an MBA with sponsorship is worth the opp. cost of 2 years' salary feel free to share insights

Thanks again!