This is to wrap up in the/my previous post ofabout the weather in Hanoi, Vietnam, which is for me is one of the hardest, most suffocateding placeds to live in Vietnam.

"To wrap up XXX," is a setup where you're going to continue with a complement. But since you don't do that here, you need the "this is..."
Since you mention Vietnam at the end, no need to also have it after Hanoi.

At day, I always feel dizzy, tired, like my head is always warm, feeland like I'm about to get sick.

At night, the temperature is drops to around 84 °F, but the humidity raises to 80-90%, which means sometimes I feel like it's even worse than at midday.

Humid = adjective
Humidity = noun

My nights are always fucked up if I don't use AC.

Alternative: My night is always fucked up if...

OIt's one of the reasons I'm always tired and spend hours in bed without being able to sleep.

Another option: "...and spend hours tossing and turning in bed." We use this expression a lot to describe struggling to be able to sleep.

I can only turn on the AC ion the most hottest days, since I'm broken.

Since "hot" is one of the adjectives that takes on -er and -est for comparisons, you never need "most" for the -est form, just like you never need "more" for the -er type.

Otherwise, almost allevery days, I always feel like I'm (just) done.

I'd throw in a "just" here for more emphasis to mean that you're fed up.

Every 25 minutes, my shorts always get wet, I gottaget wet and I have to stand up for 5 minutes to wipe my butt, yes. Really, I'm not joking.

Bit more natural to use "really" or "seriously" instead of "yes"

Every 1-3 hours, I gottahave to take a quick shower to get rid of the sweat and heat onfrom my body, which makes me feel cooler.

My phone get hot likes boil ing hot after just 2 minutes of charging, even if I remove the phone case.

(hot asf, I almost feel like it burneds my hand when I touch it) ¶
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What do I do?

I putface a fan toward that, puts it, place it onto my two bottles, makeing it like a bridge.

It's still so hot, but I don't really know what (else) to do.

And then I charge it and remove the charger every around 1010 or so minutes.

"or so" = "around" in this case

I only open the window and the curtain at night.

Unless you specifically only mean one window and one curtain, it's more natural to put both in the plural sense

Even though, itBut there's nothing I can (really) do.

I get jealous when seeing the weather ofin other cities in the world.

Iwhere it's lower than 50 to 70 °F.

Combine with previous sentence

Even though I do lie in bed for hours from suffering, I'm still proud of getting back to learning and working, even when I feel tired.

I hope one day I can make a lot of money thatso I can go manyto other places that feel better.

That's it, hope y'ou're all gdoing well too.

If you prefer slang: hope y'all are doing well too.