mm i find with my babies especially who are now thankfully nice and tame, that when i get them out of the cage, picking them up then putting down, pick up put down pick up etc and occasionally some nice treats, and letting them climb all over your body is good
Worked for mine, anyway
Mangos getting a bit like this so i'm topping up his tameness now
just sometimes get them out then put back in cage with some treats, so they know that if they get picked up nothing bad will happen - infact they get treats !
Goodluck getting further with Kit x