Buy someing teas

I used to visit a tea expo, but it isn't possible now because of COVID-19.

This year, I decided to buy my favorite teas online.

Firstly, I like drinking Korean traditional tea, which looks like a cookie.

"My favourite tea is" might be better to say rather than "firstly"
I don't know what you mean by "looks like a cookie"

It is milder than other tea, so I can drink it like pure water all day long.

NextThen, I selected some Pu'er tea at a special store.

Not sure how to correct this one, it doesn't sound natural/make sense

There is a favoriten influencer inI like who endorses Pu'er tea world, and I have followed hithem for 3 years.

This rephrasing of the sentence sounds more natural

I haven't bought his tea, but many people recommended to buying it.

LThe last one, I ordered was some black tea atfrom Fortnum & Mason.

I like cCeylon tea of the brand and I ordered two more black teas; Kenyan black tea and Russian tea.

MaybeHopefully, I will get them next week, andso I am able to enjoy them with my family.

I hope the time will come soon.

This is correct but you could say "I hope they arrive soon" or "I hope they are delivered soon" to sound more natural

This year, I decided to buy my favorite teas online.

First, I like drinking Korean traditional Korean tea, which looks like a cookie.

Next, I selected some Pu'er tea at a special store.

Last onely, I order some black tea at Fortnum & Mason.

I like ceylon tea of the brand Ceylon and I order two more black teas; Kenyan black tea and Russian tea.

Maybe, I will get them next week, and I amwill be able to enjoy them with my family.

Buy someing teas

I used to visit a tea expo, but it isn'tthis year it hasn´t been possible because of COVID-19.

This year, I decided to buy my favorite teas online.

Firstly, I like drinking Korean traditional tea, which looks like a cookie.

The phrase "which looks like a cookie" doesn't make sense.

It is milder than other tea, so I can drink it like pureI would water all day long.

Pure is not necessary, because we normally assume the water is suitable to drink. You could say tap water or, if it's from a bottle, mineral water

Next, I select some Pu'er tea at a special store.

Im not sure what this sentence means so I won't correct it

I haven't bought his tea, but many people recommended to buy it.

Last onely, I ordered some black tea atfrom Fortnum & Mason.

I like cCeylon tea of the brand and I, and I also ordered two more black teas; Kenyan black tea and Russian tea.

Maybe, I will get them next week, and I amif so I would be able to enjoy them with my family.

I hope the time will come soonlook forward to it.