How to Help My Newborn Sleep Longer at Night?

I am really struggling to get my 3-month-old to sleep longer at night. I have tried almost everything. He has a warm bath before bed, I have played lullabies, and used white noise. Adjusted the room temperature—making it warmer, cooler, and even darker. Nothing seems to be working, and I am desperate to catch up on some sleep. Has anyone tried baby sleeping pods? Do they actually help with longer sleep? I’m open to any suggestions that will get us both sleep better.