I mMiss fFireworks display.

We usually capitalize the first letter of important words in a title.

My daily life is toI usually wake up in the morning, go to work, do some housework when I get home and the rest day is sometimes going to lunch with my friend.

This sounds more natural in the US.

Every day it is repeateds the same.

We often say this in the US.

Therefore,So the seasonal event was invaluable thatfireworks event was the thing which giaves sparkle to my mundane days.

Nice use of the word, "mundane."

I especially like a good fireworks display.

or

I really like fireworks displays.

The kids in yukatas with cotton candy are runningwould run happily on traffic-controlled road,s; the couples arewould walking hand in hand, embarrassed by each other's yukata, The karaage; I bwought inld wait 15 minutes in line at theto buy karaage at a concession stand that wasn't thatvery good,; fireworks would be watched with strangers and we'd laugh together, - everything isbrings back good memories.

I *love* how you describe the atmosphere at 花火.

It haves been three years since the last fireworks display was cancelled due to COVID19, h. How long will itI keep me waiting?

I miss fireworks. (OR, "I miss the fireworks display.")

The first correction suggests you miss fireworks in general. The second correction suggests you miss fireworks at a specific event, which sounds closer to what the rest of your story is about.

My daily life is toas follows: wake up in the morning, go to work, do some housework when I get home, and the rest day is sometimes going to lunch with my friend.

Sometimes, it is easier to follow a list (of events, such as in your sentence, but it can apply to any list) if you use a ":" (colon) beforehand. What you wrote is technically correct, but it reads more easily if you break it up.

Also, the "," (comma) between "home, and" is called the Oxford Comma - it's worth researching further as it adds clarity to lists as well.

Every day it is repeated.

Remove the "it" to make the sentence easier to follow. Trust that the reader will understand the "it" you are referring to is the "day" or schedule that you mention just before.

Therefore, the seasonal event was invaluableIt was an invaluable seasonal event that giaves sparkle to my mundane days.

Sometimes, you can put the adjective before the noun - "the seasonal event was invaluable" is better phrased as "the invaluable seasonal event". The new sentence gives the reader the same information but with an easier reading experience.

The event you are referring to is in the past, so it is "gave sparkle" rather than "gives sparkle".

I especially like ad the fireworks display.

"The" is used instead of "a" because you are referring to a specific fireworks display.

The kids in yukata with cotton candy are runningrun happily on the traffic-controlled road,; the couples are walking hand in hand, embarrassed by eachthe other's yukata, T; the karaage I bought in 15 minute line at the concession stand wasn'tafter waiting for fifteen minutes is never that good,. ¶
¶
The fireworks display watched with strangers, andll of us laughing together,; everything is a good memoriesy.

These are mainly stylistic corrections; what you wrote makes perfect sense and gives the reader a clear picture of what you are describing!

The sentences are split up because it's easier to read two smaller sentences than one long sentence, especially when your sentences have so much detail. You don't want the reader to be confused -- splitting up the sentences gives the reader a little break.

I've used ";" (semi-colon) to split up the items in the list. When a reader sees a ";" they pause as if it is a comma. It's often used when the item in the list works as a sentence by itself. For example, "The couples walk hand in hand, embarrassed by the other's yukata." is a sentence by itself. But the ";" links the sentences together and tells the reader they are all pieces of the same picture.

The second sentence is edited so it places focus on the fireworks (the topic of your story) and the fact that you miss them (the meaning of your story).

It haves been three years since the fireworks display was cancelled due to COVID19, h. How long will it keep me waiting?

"It has" rather than "it have" as it's a statement that is true in the present tense, even though you are talking about the past.

For maximum clarity, you should say "How long will it be until the fireworks display returns?" but I prefer your sentence of "How long will it keep me waiting?" because that places focus on the fact you, personally, miss the fireworks, and adds a nice finish to the story. Clarity is important, but style is also personalised and your style comes through very well in this section.

My daily life is to wake up in the morning, go to work, do some housework when I get home and the rest of the day is sometimes going toeating lunch with my friend.

Every day it is repeated.

I especially like a fireworks display.

The kids in yukata with cotton candy are running happily on traffic-controlled road, the couples are walking hand while holding hands, embarrassed by each other's yukata, The karaage I bought in a 15 minute line at the concession stand wasn't that good, watched fireworks watched with strangers and laughed together, everything isare good memories.

It haves been for three years since the fireworks display was cancelled due to COVID-19, how long will it keep me waiting?