Trying new things

Okay. So me and my boyfriend of over a year are both pretty new to sex, we even lost our virginities to each other. He’s very vanilla and I can barley get him to spank or choke me. I love it when he does though. But, now i really wanna try more things like handcuffs and toys (like cockrings) but he doesn’t seem interested. I’m 16 and he’ll be 18 soon. How do I get him to be a little more adventurous?