If the world has had a time traveling machine, many things would have not been like what we have now. Fortunately we don't have such time-traveling machine and the world is organically going as it should be.

With time-traveling ability, nobody loses their bitcoins because of losing their wallet password or seed, private key. No bitcoin amount is lost by those reasons and the total supply of Bitcoin will always be 21M as well as the total circulating supply is always the same as the amount of mined bitcoins.

Many people won't lose their bitcoins because they sold cheap in the past or from forced liquidations.

In general  I believe it will only cause Bitcoin to have lower price than it has now. Not good at all for anyone.

If we had a time machine, I'd make sure I didn't start smoking, and then I wouldn't have to spend tens of BTC on smoking stuff bought on the internet for a few years. 

More seriously, it doesn't make much sense, the idea of the time machine. In any case the price would have changed drastically if someone had come along at that time with a knowledge of what BTC was going to be, right?

In my case, I would have left CPUs running at the time when you could still mine with such low difficulty that it's downright ridiculous now. I imagine that if everyone was doing this with a time machine, the difficulty of BTC would have been directly much higher and the interest would be lost.

I agree 100% with pooya87, there's no point in going through the trouble for nothing. Let's buy when we can and wait, we always have an open door to make nice profits. If you have the investment  capacity and the low $ rate per kw/h, mine and hodl, you will thank yourself later

Well, it's obvious that all of us want to go back during the time that bitcoin is priced in as centavos and, we'd buy for sure a lot of it and will just have to wait until the right time comes to sell and we'd all be millionaires or even billionaires. But, I don't want to dwell in the past anymore and I know that this is just a situation discussion but then we should be moving on and it's hard to get stuck in the past and have all of those regrets get us reminded on where are we during those great times.

We are not Doeramon who have pockets of roaming machines to the past but still it will be history and cannot repeat itself.

There's no use thinking about the early days of bitcoin because at that time most people didn't know about it, maybe now that the price is soaring higher there is a lot of interest from the community so bitcoin is getting stronger.

If the price of bitcoin already has a low price and can reach the highest price why don't we hold it from now on and then save it for a long time, we can't even predict the price of bitcoin can be even higher.

The ultimate goal is just for the money. Why doesn't anyone think of bigger goals like killing the financiers that make up the Fed or telling Einstein not to create an atomic bomb or throw scientists vaccines to avoid the pandemic? translation in the past.
It will take a lot of analysis and evaluation to make a decision when there is a time machine. Maybe the appearance of the time machine is the biggest flaw and soon brings humanity to an end.

If I have time traveling machine, I could have travelled way back in time when Bitcoin was just a few cent and stock up thousands of Bitcoin for a few dollar and become a Bitcoin OG,  but that won't happen any ways since their is no such thing as time traveling, so what we have left is the present Bitcoin price, and it's still a good time to purchase more Bitcoin because in the next couple of years to come, Bitcoin current price will become a low price to buy compared to what the price will be at that in the future.

All those Bitcoin holders mentioned above, are Bitcoin OGs who have contributed significantly to the Bitcoin network, by testing it with their Bitcoin transactions at that early time when not many people believe in idea of Bitcoin, and there was a need for the network to remain active, just like the Bitcoin pizza story that has become a memorable first Bitcoin transaction, their all contributed one way or the other to making bitcoin value what it is today even though they exchange their bitcoins at a low price back then but the goal was the ability to use bitcoin for the transaction which was success anyways.

Obviously all of us will answer buy more if we only knew it since 2009 that the price of BTC will moon this high. There are OGs that still kept the old wallets untouched which they really have a ton of BTC. They must have been the true believers of BTC since time.

There are also ETH beleivers who are doing the same. I personally worked with someone who has more than 13K Eth back 2016. That guy must have seen the repeat of history.

If I can travel time, I'd offer Lazlo more than just 2 pizzas  

Question is would you be having the capital to invest by that time? Some would say yes and some for sure would say no. Not to break the idea but the only reason why we regret not investing earlier is because we failed to do so and happened to witness how beneficial doing so. But if we would recall by that time most of the people did not invest because of doubts and lack of courage to do so. Rather than wondering what could have happen if you do this, things could still be  done at the present with proper entry and exit points. The market would either go up or down and if you have the will to still invest, it will never be too late. Just do not be too greedy of profit 'coz you cannot have all the profit in this industry.

I won't decide to go back in time just because I want to own a lot of bitcoins.
I prefer to stay in the present and continue what I started because changing the past means changing the present and it doesn't mean we can get where we want.
Maybe we think that by going back to the past, we can collect lots of bitcoins or buy them at cheap prices, but are we the only ones who will do this? Certainly not.
There must be other people who have the same desire because they already know the present events, which will make the bitcoin journey different from what it is now.
And maybe things will not be as we see now, where we can still try to get bitcoins and have that opportunity.
But that's up to each person because we all have different goals.

People back then for sure wouldn't even regret about their decisions with BTC current value before. Of course most common expectation if we got asked what we would do if there's a time machine is to buy a lot of BTC. But back then, I don't even have idea what is crypto I'm just a student who thought by studying well would get me rich. So for sure studying crypto would come first so when I got some funds for investment I could also ride the pump since there's no late comers in this industry.