Hey doubleplantnum welcome.
I am going to make a few assumptions, correct me if I am wrong.
When you say Bird of Paradise I am assuming you mean the White bird, Strelitzia Nicolai. Because the Orange birds, S. reginae, aren't commonly sold as houseplants, only as landscaping plants.
The White birds will probably never bloom inside your house. They will never attain the size and maturity needed to bloom. These are very large growing broadleaf tropical plants that mature at roughly 20 ft in height. They don't bloom until they are fairly mature. They also require a huge amount of light to bloom, in Florida (and I am assuming California) where they are commonly grown as outdoor landscaping plants, they are many times grown in full sun or at the very least 1/2 day full sun.
Likewise, the Orange Birds will generally fail to bloom unless than adequate light. When I lived in Los Angeles these were planted in almost every yard. They were huge stands that seemed to be almost constantly in bloom. The things that made them so successful there were the arid climate...they come from South Africa in very dry conditions...the extremely low rainfall in LA was perfect for them. Orange Birds need full sun, and will not bloom if they are overwatered. We can plant them here in FL, but generally, our rainfall is too much for them and they do not bloom readily.
Your Spathiphyllum should bloom in either lower light or higher light. I have dozens of them, variegated and green, and a 'black' one, that bloom constantly. But they do need ENOUGH light. Maybe your sunniest window?
