6 days without home internet 6 days without internet

Home is not necessary. When referring to the internet, your home network is assumed unless you specify.

Yes, for 6 whole 6 days my home hasd no internet! Yes, for 6 whole days my home had no internet!

"My internet was down/out" might sound more natural

As a 100% OTAKU or just a normal person. As a 100% OTAKU or just a normal person.

This isn't a sentence. Not clear what you are trying to say.

Can you imagine 6 days that, when you go home, you can’t use the internet at all!? Can you imagine 6 days that, when you go home, you can’t use the internet at all?

Mostly fine. Would pass in very casual writing

I know some people isare watching / reading or doing everything byon the mobilir phone. I know some people are watching / reading or doing everything on their phone.

Or something like "by mobile phone" or "by mobile internet" but those sound stiff and unnatural.

So, they may think that is a small problem to them. So, they may think that is a small problem.

Not needed

I use a/the/my pcomputer heavily and I definitely need a large screen to work. I use a/the/my pcomputer heavily and I definitely need a large screen to work.

Heavily doesn't really work here. Something like "a lot" or "frequently" is better

Anyway, when theit is time to renewing my contract, I will use this incident to make a biggest bargaining to thebargain more with my ISP. Anyway, when it is time to renew my contract, I will use this incident to bargain more with my ISP.