The most important tip for bullet

Do not keep playing the same openings every game

Switch them up

Trick your opponent 

ok 

ok

no

ill try in NSPBuCL match

ok try beating me Ryan, I have a trick

RY plays the JOBAVA

study how to beat the jobava

ik

try to beat your opponent by time out

yeah 1.d3 2.f3 RUN YOUR KING AROUND UNTIL YOUR OPPONENT FLAGS

lol

In NSPBuCL true and in leagues but not usually in random bullet unless you play that person continousley. 

Why should I trust you

but most people under 2k don't have an extensive repertoire they can draw on to effectively switch openings and still have good games 

I have a double repertoire, meaning two responses often

what if you don't play big matches

good

ooh i have a good one.

git gud

I get the advantage vs prepared titled players lol

I probably know openings more than most under 2000 rating (still by no means an opening expert at all though; just happen to know opening stuff somehow lol), but define: "good games." I say that because it is just bullet they are talking about - not a series of classical time control games. In bullet (and even blitz), basically anything you know decent theory into is sometimes enough to get a "good game" (or at least playable). At the very least, you save time on the clock by navigating the opening faster and this is worth more in shorter time controls.

Also, just want to paraphrase something GM Magnus Carlsen said:

When you switch openings for surprise value, you don't have to necessarily change dramatically like a 1. e4 player switching to 1. d4. Just playing a less common variation from an opening you already know well might be enough to throw your opponent off a little.