You should make a villager trading hall so you can get the best gear. Also I recommend infecting each villager and curing them 4 times so you can guarantee the cheapest prices. If your world isn't already on hard mode turn it on hard mode before you get the zombies to infect the villagers because that will guarantee they will turn into zombie villagers instead of dying. For the villagers themselves I usually get 2-3 fletchers which you can use to buy emeralds using sticks. Then I get a handful of librarians which you can use to get the best enchantments for your tools like Looting III, Efficiency V, Mending, Unbreaking III, and more. Then I get a farmer or 2 to get golden carrots, but trade with the farmer before hand because it could not always have golden carrots. The last one's are the armorer, toolsmith, and weapon smith to get diamond armor and diamond tools.
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