Started as a shower thought (literally in the shower), but decided to make it more open-ended.
My answer to this would be “watch future seasons of anime that I am waiting on”.
I don’t see how that could cause a huge ripple through time.
Well I travelled back in time and killed Hans-Johann Scherzlgruber-Vötzfenstein so the world wouldn’t have to suffer through his atrocities.
Go back in time and meet Jesus while He was here on earth
You can’t change the future (…of your original universe)
That die had already been cast, that wave function had already collapsed. The very act of traveling backwards immediately creates a new timeline no matter what.
Any change you make any step you take, is all affecting that new universe while your original universe keeps on keeping on the way that it was, except now without you in it.
So from your perspective, if you were to travel forward again, things would be different, yes. But only because you’re no longer in your original universe. The people in your original universe would see no changes because in that universe, the wave function had already collapsed, the die had already been cast.
There is no chance to EVER get back to your original timeline no matter what. Every jump backwards instantly creates a new universe (one in which the wave function collapses to reveal that you have traveled through time) and every jump forward is in THAT new timeline.
Essentially, you can’t go home again.
Literally impossible to answer without discussing what type of time travel you mean.
Regardless, the cop out answer is that the time travel you do by existing is the least impactful. You are currently traveling forward through time merely by existing.
Go back in time and prevent your time machine from working.
Nice tight little loop. Minimal interference, hopefully.
