I've been their fan since 2016, so I can called myself as a "Reveluv".

I really like their songs, it because they hasve a unique beat and good lyrics.

Can't connect two independent clauses with just comma. Instead, you should make the second part a dependent clause by adding a conjunction such as “because”. You could also make them two separate, complete thoughts.
Ex.
I like cats, they're so cute. ❌
I like cats because they're so cute. ✅ (conjunction)
I like cats. They're so cute. ✅ (separate with period)
I like cats; they're so cute. ✅ (separate with semicolon)

They always come backup with a different concept, thatnew ideas, which is why they are called as "The Queens of Concept".

“They” is plural so the name “Queens of Concept” must match
Using concept twice is redundant so I replaced the first with “idea”
Come back- to return
Come up (with)- to design/think up
With the verb “call”, you don't need any extra words to link the verb with the object. It's “Subject + call + object”, no need to add “as”, “to”, “of”, etc.

In 2023, they have_____ a world tour namcalled "RtoV Concert".

Fill in the blank accordingly:
World tour is finished at time of writing: had
World tour is in progress: are having
World tour has not yet begun: will have

They will come to my country, but sadunfortunately, I can not attend the concert.

Word choice

I feelThis makes me sad.

A little too simple/blunt, such short statements are somewhat rare in the English language. This doesn't mean to make things overly complicated, as redundant and roundabout language can also be a problem for learners. Just do your best to strike a balance between too much and too little information :)

I hope I can meet them in another chanctime.

Another time - adverbial phrase
In another time - prepositional phrase which would only really be appropriate if you're talking about alternate timelines (ex. “In another time, maybe we could have met before things got so bad and we would have had a happy life together.”)
“At another time” is a prepositional phrase that WOULD work in this scenario

I've been their fan since 2016, so I can called myself as a "Reveluv".

I really like their songs, ithey hasve a unique beat/rhythm and good lyrics.

They always come back with a different concept, that is why they calledare known as "The Queens of Concept".

In 2023, they havewill be launching a world tour named "RtoV Concert".

They will come to my country, but sadly, I can notwill not be able to attend the concert.

I hope I can meet them in another chancnext time.

I've been their fan since 2016, so I can called myself as a "Reveluv".

They always come back with a different concept, that is why they are called as "The Queen of Concept".

In 2023, they haved a world tour namcalled "RtoV Concert".

Tenses

I hope I can meet them in another chanctime.

Or I hope I get another chance to meet them.

I've been their fan since 2016, so I can called myself as a "Reveluv".

They always come back with a different concept, that is why they're called as "The Queen of Concept".

In 2023, they will have a world tour named "RtoV Concert".

I hope I can meet them inhave another chance to meet them.