I'm talking about European football, which is also called 'soccer'.

I was a fan of the football club "Manchester United football club".

I guess I should have become their fan, but I was appealed by the other team from the north of the countryfound the aforementioned northern team more appealing.

or: "one might expect I would have become their fan at this point"

"I found Manchester United more appealing"

They played in an uncompromising, male style, as Arsenal played more sophisticated, technique football.

I'm not sure if "technique football" exists as a technical term in the field of sport. I would have said "football with good/strong technique", but I don't know much about this topic.

I think 2003 was the last year of David Beckham in Manchester United.

better: David Beckham's last year

After that season, they bought Cristiano Ronaldo, ands well as Wayne Rooney on the next year, who became my favorite players for the next several years./

It's already been 3-4 years since I've quit following Manchester United for 3-4 years already.

Still, I havefeel a lbittle of nostalgia aboutfrom thate times when I was their fan, and(from) the great victories and loses I went through with my favorite team.

I'm talking about European football, which is also called 'soccer'.

I was fan of Manchester United, the football club.

There are other ways to express this:
- "the Manchester United football club" (works with this name, though with others it won't)

It was the year of the mighty, unbeatable Arsenal from London.

See this: https://ell.stackexchange.com/questions/214813/using-the-definite-article-the-with-adjective-before-a-persons-name

I guess I should have become their fan, but I was appealed by the other team from the north of the country.

They played in an uncompromising, male style, as Arsenal played a more sophisticated, techniquecal football.

"Male" is fine, though I would possibly use "masculine" unless I wanted to emphasize maleness.

I think 2003 was the last year of David Beckham inwith Manchester United.

After that season, they brought on Cristiano Ronaldo, and Wayne Rooney on the next year, whoand they became my favorite players for the next several years./

"Who" should be placed immediate to what it modifies, here "Cristiano Ronaldo and Wayne Rooney."

Still, I have a little nostalgia aboutfrom thate times when I w that I spent as their fan, and the great victories and loses I went through with my favorite team.

I'm talking about European football, which is also called 'soccer'.

It was the year of mighty, unbeatable Arsenal from London.

When you have two adjectives describing one noun without the word 'and' put a comma after the first adjective

I guessthought I should become their fan, but I was appealed byfound the other team from the north of the country more appealing.

They played in an uncompromising, male style, whereas Arsenal played more sophisticated, technique-based football.

After that season, they brought Cristiano Ronaldo, and Wayne Rooney on the next year, who became my favorite players for the next several years./

You can say bought and drop the on or you can say brought on. they mean different things but both would work here

Still, I havefeel a little nostalgia aboutfor thate times when I was their fan, and the great victories and loses I went through with my favorite team.