Some ideas, all with three objects:

- Throw one over your shoulder/under your leg/around your back/

- catch each ball with your palm facing down instead of up

- Out->in cascade (throw from outside, catch from inside) instead of the traditional in->out

- 3 columns

- over the top (tennis)

- Any "mess"

- Any "box"

Then all of the above, but with

- 3 clubs

- 3 cigar boxes

- 3 clubs on fire

- while riding a unicycle

That should keep you going for a while

https://libraryofjuggling.com/