For excellent SEO results you must use the EXACT keywords that shoppers use. Marmalead and other similar tools only show keywords that other sellers use and only the keywords that are used in listing tags. The best keywords are otfen found in listing titles. . Etsy sellers use a mix of good and bad keywords that do not work. Marmalead can be source for keyword ideas but these should all be checked with a real keyword research tool to see which ones are used by shoppers and if they are popular enough to use in the listing titles and tags. There are better keyword research tools that show the keywords that shoppers use.
Keyword Planner is the best keywords research tool. It not only shows how popular each keyword is with shoppers but also makes several hundred alternate suggestions, many of which are better than the keywords we come up with. This tool is complex and takes time to learn to use. Keyword Planner is here: adwords.google.com
A second best and easier to use keyword research tool is on serp.com at
https://serps.com/tools/keyword-research/ which also has long lists of keywords and shows how popular they are with shoppers.