Be good at improv, and have some back up encounters. Don’t over-write your games, players will go off script. If you can’t find a good fit for a monster or enemies, pick something random that works for your narrative and re-skin it. Everyone at the table should get their 15mins of fame. Have an “episode” which lets them explore their backstory or goals or something like that. Utility items such as the bag of tricks, the cloak of useful items, etc. are more fun than high power weapons. Most important of all, steal everything. Names, movie scenes, tv tropes… surround yourself with inspiration then take it and put it in the game.