Where do I start?

So my boyfriend(21m) and I(22f) recently realized we are poly-romantic/sexual. He's straight and I'm bi, and he completely understands where I'm coming from when I'd told him I had room in my heart for another woman. Basically, I don't know where to start in finding another partner. I'm nervous to go down the dating app route but it seems equally as daunting finding a partner in the outside world that'll take me and my boyfriend. Basically, does anyone have any suggestions?