My bike got stolen a second time (in Amsterdam) - what should I do? I've moved to Amsterdam a few months ago, and have started using bicycles; I mostly cycle from home to work.

I've been using typical old(ish) used bikes, black-color omafiets of some obscure make, with a front basket mounted. It had a (simple?) ring lock and a 20-25 EUR chain lock.

My first bike was stolen from near work. Never mind the circumstances, but I bought another one and made sure to always keep it in my workplace's locked bike shed where I feel it's pretty safe.

However, just last week, my second bike was stolen from near my home. I had parked it at a main intersection - assuming the visibility numbers would make this a safer choice. Both locks were on, and the chain affixed the bike to a metal bike-stand. Still, it got stolen overnight.

I'm wondering what to do...


Should I plan for my bike occasionally getting stolen and repeatedly buy cheap ones? 
Should I buy a more sturdy, more expensive lock for my new bike? 
Should I spend money on customizing the bike so as to make it more theft-repellent? 
Perhaps I should just change my assumptions and park my bike someplace less conspicuous to begin with? It would make the bike less visible to bike thieves, but would allow them to operate more safely, since few people would notice and if someone noticed they could just run off.


Advice would be highly appreciated.

Notes:  


Amsterdam-specific (and Amsterdam-popular-bike-model specific) answers are welcome; and that fact, specifically since the city is very prone to opportunist bike theft, makes this question a non-dupe in my view.
I can't keep my bike indoors overnight - I'm living in an apartment building with a narrow staircase and not much room, this is not a relevant solution (for me at least). Obviously if I could keep indoors it would be a whole different issue since bike thieves don't break into people's houses (that makes them burglars).
I'm not going to find my bike, so I'm only asking about next time.
Buy more secure lock(s) for your bike - I have a Kryptonite New York Standard and a Kryptoflex cable that I leave in work for my commute. I also have a New York Fahgettaboudit Mini for using about town on my single speed (no quick release installed on this bike).
Utilise new/better lock from above to secure your bike in a more productive fashion. Personally I will place the u-lock through the rear wheel and seat tube like the image below




You also have to consider that thieves want a quick and easy job. If your bike is secured like the picture above with a strong lock, they'll probably just move on to an easier target unless it's a very valuable bike which you've locked in public, something I'd advise against.