I'd say start a side hustle that interests you over going to work for the man for 10 hours per week for $10 per hour. Do something you enjoy. And if you aren't worried about living off it, anything you do make is gravy. Plus you'll actually enjoy the work!
I've been listening to financial independence/early retirement (FIRE) podcasts and reading some and I think retiring in 5-10 years (I'm 35) is definitely within reach assuming I can knock back my expenses to $35-$40k per year (not sure that's something I want to do) but outside of continuing to focus on our real estate portfolio - I have no idea what I'd do with myself.
Are you single?
Seriously, that would be great if you could retire at 40. Can you give me a ballpark of how much you have saved so far? If you're trying to get your expenses to $35k, does that mean that you have $400k saved already??? Wow, that would be a ton. I'm assuming you're using the 11% mentioned earlier in the thread for what you'd make on your $$$.
Am I thinking of this right?