Nap help!

My baby is now 15 weeks old and he has the worst sleep associations, he can sleep at night pretty well, but he can't nap without being rocked or bounced. Once I rock or bounce him, he will only sleep on me, snd refuses to be put down in bassinet. Sometimes the bouncing/rocking can take more than 40 minutes.

We have a routine and I check his sleep cues, but still it doesn't work.

I tried taking cara babies, he cried nonstop so I didn't continue her method. Also tried PU/PD method for one day and he cried uncontrollably.

I just want to be able to not have to rock him to sleep, and get him to sleep in his bassinet for naps