The first one is
F2F, where you buy Bitcoin using cash, cash is anonymous, so they will not able to track your money.
Thanks for this little information but it is not the best. Because it will cost additional expenses for the seller or the buyer, whoever travel to meet the other will spend more on transport unless they are on the same location with 10 to 20 kilometers trek or movement.
Op you are still dreaming and I you have to wake up from that deep sea dream. Bitcoin is still in $100k and you are dreaming 1m, and the funny part is that, you said it is coming soon. There are something you need to avoid saying because it is not realistic at the moment. Bitcoin started from 1-100 as it is for 15 good years now and it will start again from 100 to 1m and we don't know when that will happen and it will at anytime soon.