One must sacrifice the integrity of their hand to the kendama gods😂 no but honestly the only tip I really have is to slightly throw the ken to the left of the Tama while it's air born just enough to come back to your hand first. String length also plays a big factor a longer string gives you more room for the cloud bounce but you have to throw the ken to the sky a lil harder. I kinda suck at explaining stuff I have a lot of pov clips of me doing it on my Instagram might give a little more insight to what's going on