Hey, I'm interested in your project.I’ll instead tell you what a strong proposal should represent:
you have carefully read the project requirement & are confident in taking up the project
you are qualified for the task / have executed similar projects in the past (if any)
you can complete the project on time and within client’s budget
Few suggestions:
It should be pleasing, crisp, and well-organized
It should address the client’s requirement and you can achieve the results s/he seeks
Avoid using scripted proposals and sounding impersonal