Blue door is a monkey's paw. You go back in time? You butterfly-effect shit you didn't intend to.
Buy a bunch of Bitcoin? A series of unanticipated changes means people figure out it's a pyramid scheme early and by around 2017 or so, the last Bitcoin miner shuts down. But hey, at least video cards are affordable!
Bring back Lotto numbers? Well sorry, buddy, but just by breathing the air differently, the air currents where the numbers are drawn are affected, and you're left with zilch.
Got kids younger than 10? They don't exist anymore! If you try to have them again, you end up with other kids who are similar, but not the same as the ones you loved... and have deleted from the timeline.
The answer to these time-travel opportunities is always to run screaming from them. But hey, at least with this one you've got an alternative where you become an instant millionaire! Take the $10 million. Don't fuck the timeline up.
Bonus points, odds are you will have a really hard time re-meeting your partner. You're probably a totally different person than you were when you met. The chemistry that got you started is now not there and who knows how you mix now. It may still work, but they might be weirded out by how much you know about them.
For both your sakes, the best option may be to never meet.
Speak for yourself! As someone who will literally be married for 10 years in 2 weeks and has 2 kids I'm going back baby! How else would I stop the marriage! Yeesh.