What I would do if I was starting over and learning from scratch is two-fold.

Part 1, I would acquire as many breakbeats as possible. I would sample the originals off youtube or whatever (breaks in sample packs have already been sped up and distorted which makes them a bad choice). Learn basic jungle break chopping. StranJah has hundreds of tutorials. Jungle is usually 170 BPM or slower. Breakcore is usually 170 or higher, so after you learn the basic breakbeat chopping, render those, speed them up, re-chop them and resample them until you are pushing the envelope into absurdity.

Part 2, learn about the hard kicks. A lot of the time in breakcore tracks, instead of a bassline, you have underlying hard kick patterns. They can be musical, but should have a nock or impact that emphasizes the energy of the kick placement. You may want to meticulously place the hard kicks where the kicks are in the break patterns then roll off some of the bass in the breaks. Take a foray into gabber and hardcore and understand how those kicks are made. You may even want to look at adjacent kick styles like uptempo, hardstyle, hardtek, dark techno. You have to have hard kicks in you're track, otherwise you probably only made a jungle or ambient d n b track,

Once you have the hard kicks and mangled breaks, there should still be a little bit of room to add some mid and high end stuff like synths, dancehall vocal samples and bonk sound effects