Needless to say, I’ve been onhit a plateau. Needless to say, I’ve hit a plateau.

Needless to say, I’ve been on a plateau. Needless to say, I’ve been on a plateau.

I want to get better at my English skills and cooking. I want to get better at my English skills and cooking.

Since you are talking about your English skills directly, you should put "my" in front of it Also, there's more than one skill involved in English (for example: reading, writing, listening, speaking...), you should say "English skills" instead of "English skill"

I want to get better at English skill and cooking. I want to get better at English and cooking.

I want to get better atimprove my English skill and cooking skills. I want to improve my English and cooking skills.

The other corrections are good, but this is fine as well

I’ve lived in Australia for five months, but I don’t feel like my English skills have been improving, especially with my listening and speaking abilities. I’ve lived in Australia for five months, but I don’t feel like my English skills have been improving, especially with my listening and speaking abilities.

Sounds smoother like this. You need a comma before "especially" and "but" Explanation with especially: https://ell.stackexchange.com/questions/101127/should-we-always-use-a-comma-before-especially Explanation with but: https://www.grammarly.com/blog/comma-before-but/

I’ve lived in Australia for five months but I don’t feel my English skill improving, especially listening and speaking. I’ve lived in Australia for five months but I don’t feel my English skill improving, especially listening and speaking.

When I negotiate something with someone and try dealing with customer’s complaints, I wouldtypically struggle how towith convinceing and how to say withtalk formally and correctly in English. When I negotiate something with someone and try dealing with customer complaints, I typically struggle with convincing and how to talk formally and correctly in English.

You can just say "customer complaints" when you are dealing in customer service, but if you are talking about one specific customer, then say: When I negotiate something with someone and try dealing with a customer's complaints...

When I would negotiate something with someone and try dealing with a customer’s complaints, I would struggle with how to convince them and how to say things with formal and correct English. When I would negotiate something with someone and try dealing with a customer’s complaints, I would struggle with how to convince them and how to say things with formal and correct English.

When I negotiate something with someone and try dealing with a customer’s complaints, I would struggle with how to convince and how to say with formal and correct English. When I negotiate something with someone and try dealing with a customer’s complaints, I would struggle with how to convince and how to say with formal and correct English.

In addition, I don’t like to phone in English, i. It’s too difficult to listen to what they say. In addition, I don’t like to phone in English. It’s too difficult to listen to what they say.

I think it's Australian English to say "to phone", but in American English, I would say "I don't like to talk on the phone in English" or "I don't like to call in English"

In addition, I don’t like using the phone in English, -- it’s too difficult to listen tohear what they say. In addition, I don’t like using the phone in English -- it’s too difficult to hear what they say.

In addition, I don’t like speaking on the phone in English, i. It’s too difficult to listenhear to what they say. In addition, I don’t like speaking on the phone in English. It’s too difficult to hear to what they say.

I prefer texting to calling, but I know I have to practice ithis skill. I prefer texting to calling, but I know I have to practice this skill.

I prefer texting to calling but I know I have to practice it. I prefer texting to calling but I know I have to practice.

I prefer texting to calling but I know it's something I have to practice it. I prefer texting to calling but I know it's something I have to practice.

Your original sentence makes sense, but the 'it' at the end is a bit unnatural.

For cooking, I can’t cook many kingds of food, so I want to step up my game and broaden my range of cooking. For cooking, I can’t cook many kinds of food, so I want to step up my game and broaden my range of cooking.

For cooking, I can’t cook many kingds of food, so I want to step up my game and broaden my range of cooking. For cooking, I can’t cook many kinds of food, so I want to step up my game and broaden my range of cooking.

As I love Thai and Indian foods, I want to try to make it from the scratch by myself. As I love Thai and Indian foods, I want to try to make it from scratch by myself.

As I love Thai and Indian foods, I want to try to make ithem from the scratch by myself. As I love Thai and Indian food, I want to try to make them from scratch by myself.

It seems to be difficult, but if I could cook it, I could eat it every time, it mustthese types of foods, I could eat it all the time and it would be amazing! It seems to be difficult, but if I could cook these types of foods, I could eat it all the time and it would be amazing!

It seems to be difficult but if I could cook it, I could eat it everyall the time, -- it mustwould be amazing! It seems to be difficult but if I could cook it, I could eat it all the time -- it would be amazing!