Skip the queue on the ACNH Exchange app.
ACNH Exchange skip the queue is a chrome extension that will detect automatically when a queue is available given your criteria (minimum turnip price and maximum queue size) on https://app.animalcrossingexchange.com/turnips/traders
By using this extension you won't need to refresh the page forever/keep looking at your screen for the best opportunity, instead the extension will notify you with a sound an auto focus on the tab + it will automatically open the Join Line popup.
Note: As soon as you have joined a queue, the extension will stop looking for better price, so you need to leave the queue before the extension listen for better prices again.