I'm going to assume that you're asking because you're new to either Upwork or freelancing altogether.
There are many reasons as to why you might not be hired often. Personally, I used to get hired on 90% of jobs I applied for. Now I don't use Upwork too often as I personally feel as though the quality of freelancers and clients has dropped significantly. I digress.
You're competing with other freelancers and you need to prove that you're better than the other options and are affordable.
- Rates matter
If the average project bid (let's just say it's a fixed-price job) is $500 and you come in with a bid of $1,500 the client likely won't look at your profile you're too expensive (caveat is what the client sets as their budget). If you come in with a bid of $100 then common sense says this may not be a quality freelancer.
- How you carry yourself matters
Issue number one is you addressing the client as 'freelancer'. If I saw this, instant reject. This shows you didn't proof read your bid and if you're not willing to put in that much effort, why would you put in more for my project?
You only talk about yourself. You need to tell me how you're going to help ME. Yes, you know HTML & CSS but so does every other freelancer that I'm going to give the time of day to. How are you going to help me and provide a better service to me than the other freelancers'.
Your selling point should come after you list your skill set but before you call an action.
Please check the tests that I have passed related to Web Design with the high score of (top 30%).
Why should I check your profile? There's a dozen other freelancer's who have told me how they can make my project a success and you want me to go out of my way. Unless I'm already interested in you - I'm not looking at your profile.
There is some poor English here which is understandable if it's not your native tongue but spending a few bucks on a proofreader or running it through Grammarly can't hurt.
I have also listed my most expensive and tough projects on portfolio.
This is poorly framed. Frankly, no client cares what the most expensive project you've done is. You can talk about complex projects due to scale or difficult features you've implemented.
I believe my skills would be perfect for your project.
What skills? Yes, you listed off that you know HTML, CSS, JS, etc but there's no indication on every project that the client knows what these are. I want to know that my website will look original, that it will be mobile-responsive, etc. I don't know the benefit of you knowing JS, PHP, .NET, SQL, etc. I just know that I need a website.
I hope you would find Quality in my work
I shouldn't need to find quality in your work. It should be apparent. However, this could be a language barrier thing. A better phrasing is
"You can see some of my quality work below" - proceed to list of projects.
Here are my Few projects
(PSD TO Bootstrap): ...
(PSD TO WORDPRESS): ...
Not too much insight here, which is fine, but what you put here is very important.
Make sure that you're showcasing sites (link) as well as explaining what you did for this project. What amazing feat did you accomplish? Think outside of development as well. Did a site you built increase onsite conversions by 50%? Include that - if it's true.
Was the website horribly outdated and you updated it? Include a link to the archive of the site before you worked on it and after.
Here's a good general format for bids and I suggest you do some A/B testing on different formats and content.
Skills you have that are relevant to the project & that may be additionally useful (project calls for a website redesign and you have content writing skills? Mention it.)
How you're going to help the client. This is the most important part. How will you complete all the requests the client has. How are you going to do a better job than everyone else? What is your game plan?
Sales pitch. This is where you mention the tests you've passed, ask the client to view your profile, LinkedIn, etc. As well as elaborating on what makes you special.
Projects. This is where you list, in detail, the projects you've worked on and what feats you overcame to complete these projects. The more relevant they are to the project you're bidding on, the better.
Again, please create your own method and test what works for you.