5G isIs 5G around the corner?

Anyway, maybeMaybe it had started one or two years ago.

You generally would not start a new story with "Anyways". Usually this is referring to something you already wrote.

I sawThe US was testing cars with autopilot carspabilities back then.

Yesterday, I realized that China is tesalso conducting autopilot butests, but with buses instead of cars.

Looks likeIt appears that all the transportation toolmodes will add “autopilot” in front soon.be adding this “autopilot” feature soon, including buses, taxis, trains, etc.

You could also say "in the near future"

Autopilot- bus, taxi, train…

I combined this sentence with the last one.

Do you think later we will have products likeventually have autopilot shoes, and bicycles?

What aboutAnd do you think we'll have 6G?

WIf so, what will happen in a 6G’s world?

Maybe we will have a time machine that can travel back in time.

But why? How does this wish correspond to the autopilot cars buses, and other things? How about 6G come into the picture?

5G is around the corner?

I'm not sure 5G has anything to do with self-driving vehicles, but there's nothing wrong with the English. (I'm pretty sure my smartphone is using 5G now.)

Anyway, maybe one or two years ago year or two ago, I saw that the US was testing autopiloted cars.

'Anyway' refers to a previous thought, which you don't have here, so it's inappropriate. The rest of the first line is okay, except that it isn't a sentence. There is no subject or verb. You need to combine it with the next line to make a sentence. And I would drop the 'maybe', because you're already introducing uncertainty about when this happened by saying 'one or two years', but it's idiomatic English to use it, at least in speech.

I saw US was testing autopilot cars.

Yesterday, I realizelearned that China is testing autopiloted buses.

It's possible that the usual term is 'autopilot' and not 'autopiloted'. Autopiloted is grammatically more correct, because it's an adjective, not a noun, but sometimes technical terms don't make grammatical sense.

LIt looks like all the transportation tools will add “autopilot” in front soon.vehicles will soon have “autopilot” before their names.¶

By the way, the term I have seen and heard used is 'self-driving', but it's quite possible that 'auto-pilot' is also used.

Do you think later we will eventually have products like autopilot shoes, and bicycles?

What will happen in the 6G’s world?

Maybe we will have a time machine that can travel back in time. ¶
¶

You don't need 'time' to appear twice. And you need 'that' to connect the clause 'can travel back in time' to the 'machine' in your main sentence.