always keep track which finger you started a stream on and in general every four notes emphasize that finger (i.e. press harder), or eight notes. basically always know where the beat is and press accordingly with your finger. later on you won't really have to press harder and it just becomes ingrained in your mind.
you don't have foundations which makes improving harder. sure maybe you can stream 200bpm or a little higher because of muscle memory, and thus you can only do a small range of bpms. you don't have that mind powered clock that rigidifies your stream accuracy. upon learning higher bpm it's just going to be a spamfest, and you'll just be hitting as fast as you can hoping to get 300's, instead of having confidence in such consistency.