Upwork works like a search engine. (like Google)
When a client needs help, they type in exactly what they are looking for — and Upwork shows them profiles that match.
Clients don't search for "freelancer" or "hard worker." They search for exactly what they need — and Upwork shows them profiles that use those same words.

Upwork Search
If your profile does not use the right words, the right clients will never find you — even if you are exactly what they need.
Put your most important keywords in these places: