My only gripe is that the tasks by your co-workers are often unreasonable, like using a letter 7-9 times is undoable, particularly if on the first guess you find there are 0 of them.
I can do those, you just have to use words with the chosen letter twice in any words you pick. that still leaves you three letters to help confirm or eliminate.
Ultimately it is more important to complete the task the worker sets than to guess the word, as the sooner you do the task the sooner you get rid of them and can get back to racking up points. (if you have to do 9, you have to use the chosen letter 3 times in one word, but those are super rare), Just keep picking the letter that you have to use, even if it is incorrect.
Not saying you are, but if others are struggling here is a link to a website which can help you find the words
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If you turn on strict search, you need to add another row each time you want to show a letter is in a different position.
99.9% of the correct words are common words, so it is well worth turning that filter on for the search results
When doing the double letters, add an additional row at the bottom, and put any correct letters in there until you have hit the letter count, then put them in the proper place, that way you can run through the greatest possible number of letters with minimal repeats, and still have a decent shot at getting the correct word, the only time I miss is when there is a word where you have 4/5 letters and there are 3-4 words that it could be and you just have to take a punt and get the wrong one.