Nothing without nipple stimulation

Heey, so I started my journey almost a year ago with a Helix trident & I feel like I’ve been making progress. There have been times where I feel like I was close to something big. However, I recently noticed that if I don’t stimulate my nipples, I don’t feel anything down there. I’ve tried contracting & releasing muscles, but I don’t feel anything. As soon as I start playing with my nipples it feels good down there. While it feels good, it feels like most of the stimulation comes from playing with my nipples & not contractions. Also, it feels like the Aneros is just short of hitting the right spot, like it’s just below where it should be.

I’ve never been able to locate my prostate with a finger & I’m not sure if I ever hit it with the Aneros.

Not sure what to do. I’ve been thinking about getting a different model. Any advice is appreciated!