How I can improve my profile/cover letter to attract my client

[enyaude]

I have been here for getting to a year now and have been sending proposal but have not gotten any work approval.

How can i improve my profile or cover up letter to enable me to start getting clients. I am a data engineer/data analyst/data scientist. Please I need to start making money here because I need money for my upkeep and I have seen a lot problem i can solve here. You assistance is very wecome. Thanks.