Ok, as some people said, you don't NEED a huge impact at the drop, but if you WANT a kinda 'holyshitwtf' moment, there are some things you can do. Here are the really obvious ones, which are a bit cliched, but still good.
The most important is to have a really big sound to come in. Look up making dirty basses and stuff. Most of the tutorials are on massive, annoyingly but you can get pretty similar results if you know the theory.
As well as this:
1. Withhold bass for as long as possible. Don't put in any bass, then put all the bass and sub-bass in at once.
2. Just before everything kicks off, strap a high pass filter (maybe with resonance) over everything and sweep it up
3. Put a loop of some description in (could be drums, vocals, lead,) then retrigger it faster and faster as you lead towards the drop.
4. Use an extended perfect cadence (V-I). Hang on to the V for ages and ages, and maybe make it a V7, then resolve to I. If you know anything about chords, look it up. If you don't know anything about chords, don't worry.
5. Put in some kicks on every quarter note, then every eighth note, then every sixteenth note... it's the world's biggest cliche, but loads of people do it.
6. A few bars of silence have already been mentioned.
If you don't know what any of these terms mean, ask, or look them up.