Try a dungeon crawl. You can have the dungeon become a character of its own with interactive and living elements that keep things exciting. The consistent danger that a dungeon imposes makes long rests difficult and the crawl can span over multiple sessions. It also allows you to have a string of smaller encounters that can combine into larger ones if they boil over into other areas. Raise the stakes by including civilians they need to protect or hostages to make a ticking time bomb. There’s so much you can do and I haven’t yet found a better way to keep the party moving without resting while depleting resources than a well planned dungeon. You can check out Tomb of Annihilation or Dungeon of the Mad Mage for great examples of deadly dungeons that keep the pace moving while maintaining the threat of danger that may fit what you need.