I'm planning to travel 20 million blocks with a group of my close friends (4 total) and start an insanely isolated base over the course of whenever we can be on and we plan to make it a somewhat straight line but does anyone have any advice? Any tips and tricks are appreciated ???? morale isn't much of an issue as we've done this type of thing before and have traveled 100,000-125,000 blocks in a day's work. (Bedrock 1.21.60)

EDIT Thanks for the advice everyone, We're setting our goal to 7.9 million blocks (just before the world begins to break) and just see how long we can start a group world before someone or all of us accidentally die and spawn 7.9 million blocks away (Yes we know it's a stupid idea lol)