The shop announcement text works together with the keywords you use in the shop title and section names. They all are used by Google to index and rank your shop in the search results.
Add SEO to every part of your shop so that your shop and listings can be found on Etsy's Relevancy search and on Google.
Don't guess on the wording for keyword phrases. Start with using keyword phrases that are often used on Google to search for similar products. The keyword phrases popular on Google are also popular on Etsy.
I suggest using Google's keyword research tool to find appropriate keyword phrases for your listings; adwords.google.com/select/KeywordToolExternal?forceLegacy=true
SEO for Google is a lot more than adding keyword phrases but this is the place to start.