It's possible that your Upwork proposals are not being responded to for a few reasons. One major reason could be that your cover letter and proposal are not appealing to potential clients. It's important to make sure that your proposal stands out and clearly communicates your skills, experience, and enthusiasm for the job. Additionally, it's essential to tailor each proposal to the specific project and client, rather than using a generic template.
Another reason your proposals may not be receiving responses is that you're applying for jobs that are not a good match for your skills and experience. It's crucial to carefully read job descriptions and only apply for projects that you're confident you can complete successfully. Furthermore, if there are many other freelancers applying for the same job who have more relevant experience or skills, it may be challenging to get noticed by the client. To improve your chances of getting hired, consider gaining additional skills or experience in your field, or offering your services for free to build up your portfolio and gain valuable experience. Additionally, volunteering for nonprofit organizations can be an excellent way to gain experience and build your portfolio while also making a positive impact.