Consistency is a very important factor for achieving our goals.

"a" or "one" would work here

I want to reach a native or close to native level English language skills.

"a" has to be removed because it refers to "skills"

I am not sure about this, but I would normally say it as: close-to-native

In order to make this a reality, I must practice daily, even for 10 minutes on busy days.

the first comma is needed because of the introductory prepositional phrase

the second comma is needed because it contains parenthetical information

Consistency is a very important factor for achieving our goals.

Without consistency, it becomes very hard to reach our destination.

I want to reach a native or close to native level in my English language skills.

In order to make this a reality, I must practice daily - even if only for 10 minutes on busy days.

"practise" is the verb in British English with "practice" as the noun HOWEVER, "practice" is used for both in American English

Consistency.

Consistency is veryan important factor for achieving our goals.

Some synonyms for important are vital, crucial, key, and major.

Without consistency, it becomes very harddifficult/arduous to reach our destination.

I'm giving you alternative words for the word to increase your vocabulary.

I want to reach as a native level or close to native level in English language skills.

In order to make this a reality, I must practice daily, even for 10 minutes on busy days.

Consistency.

No need for the period since this is a title

Consistency is a very important factor for achieving our goals.

Factors are countable

Without consistency, it becomes very hard to reach our destinationgoals.

Reaching a destination is to reach an end, but sticking with "goals" is better here

I want to reach a native or close to native level in English language skills.

"Language skills" is unnecessary here and is better without

In order to make this a reality, I must practice daily, even just for 10 minutes on busy days.