Hey there! This letter is a great start and it looks like you have some great experience to make you a competitive applicant. Here is some general advice that can help bring your letter to the next level.
Also, I do not know if they offered any guidelines so if they have please provide them here.
1. Be more direct. If your letter does not catch their attention with the first or second line, the admissions official might not even read the rest. Make your point quickly and concisely. Your first line for example: "This is to state that I have written this cover letter to you as I earnestly seek an admission for the program...." I recommend cutting out some unnecessary words. Try instead: "I am writing to formally apply for [program] at [school] so I can achieve [your goal here]" Remember this is a motivation letter, and your motivation should be apparent right away.
2. Talk about yourself, not just what you've done. You list your skills in the first paragraph which is good, but consider framing it in a different way. Instead of "I have skills in this, this, this and this," Talk about how you learn and use these skills. For example: "My job at [company] helped me develop excellent management skills. Part of responsibility was [something] and I used my [skill] to [result]. Giving concrete results helps to illustrate your skills.
3. Don't be too negative. Talking about "shortcomings" and "low strength" is okay, but it's important to focus on overcoming problems and showing improvement. For example, if I'm interviewing a potential employee and they say, "I have problems making machines that function well for a long time" I will not hire them. But if they say, "I find it challenging to design long-lasting machines, but in the last three years at my work I've increased longevity by an average of 26% and I continue to work with others to seek innovative solutions" I will be much more impressed. Admitting weakness is fine, but show us how you will overcome this.
- Related, I would not mention, "I am not aware of the supply chain logistics involved" Instead, I would go directly to, "I hope to learn the skills in supply chain logistics that I need to successfully make my idea a reality" or something like this.
Feel free to ask any questions in this thread and I will give the best advice I can. Good luck!