decisions

Hey guys so I went from a single cheap 250 watt Jbl sub to 2 250 watts rms kenwood subs. Honestly I liked the Jbl one better but recently I’ve been wanting more bass. I currently have 1000 watt max amp, it does 300 at 4 ohms and 500 at 2 ohms. So I was wondering what should I do to get more...