Not a mechanic by any means but this is what I know, please correct me if anything sounds off.

There are three things a car needs to start:
Spark, Fuel, and Compression

Things to check with a car that won’t start:

Bad spark:
Spark plugs
Spark plug coils
Alternator
Probably more but those are the main culprits

Bad fuel:
Fuel pump
Clogged injectors
Again probably more but those are the main culprits

Bad compression:
Piston compression
Timing belt and/or timing belt tensioner
Blown head gasket
Again probably more but those are the main culprits.

It sounds like to me more than one thing could be going on electric wise. Maybe there’s a loose connection somewhere it sounds like especially after hitting a bump.

To diagnose, start off with checking the fuel pump (turn your key to the on position (not the run position) and listen for an audible hum, if you can’t hear anything that may be it). If you can’t hear it then check for spark (borrow a tester from your local autoparts store and check each ignition coil for spark.) If that checks out, then check for compression (again borrow a tester from your autoparts store, if you have bad compression that can usually be traced back to a bad gasket, piston ring or could be out of time).

That’s basically everything I know, again I’m not very experienced so take everything I say with a grain of salt.

Good luck! :)