This Farm was only tested in version 1.21.10, but it is very likely to work in previous and later versions.

Total XP Farm AFK with a Cactus Farm burning items in Furnaces and Carpet Dupers as fuel.

This Farm is designed this way to occupy a 3x3 Chunks space and be loaded all the time, either with a Chunk Loader with portals, in the SpawnChunks, or with 9 Chunk Loaders with Ender Pearls.

More than 4000 cactus are needed to maintain a constant production flow in the 16 furnaces and prevent them from running out of items. In theory, and according to Gemini, approximately 2304 cactus are needed to maintain constant cactus production and supply the 16 furnaces, but many cactus fall off the platform that collects all the items and many others are destroyed in the same cactus.

(You can add or remove furnaces for higher or lower production, but you will need to do calculations for the required cactus production) (You can use any fuel and fill the furnaces and hoppers; But to make it renewable, add a simple Carpet Duper for the fuel, which is enough and more than enough) (Also keep in mind that if you add more furnaces, you will need to add another Carpet Duper, as one is already very tight)