Do you believe in the power of dua?

Here is my story.

Last ramadan i desperately wanted something. Did everything in my power to achieve it and left the rest to Allah. You know as everyone says " mahnat kro or phr allah pr chor do" . I did exactly that.

Plot twist. I didn't get it.

Now comes the advices that " Oh, maybe it wasn't good enough for you. Allah will replace it with something better" etc.

I hated this advice but still did sabar. And then soon enough something happened that made me realise that people were right. That "thing" wasn't good for me.

Now comes the strange part. Even though now i know why Allah didn't fulfilled my desire , i still can't bring myself to do dua. I pray 5 times a day but don't ask Allah for anything. Even in ramadan, when everyone is praying before iftar i just raise my hands and say nothing. It's like my mind is saying to me that my dua doesn't matter. I will pray for something and will not get it and in the end i would have to do sabar. The cycle would repeat itself so what's the point of having false hope??

Does anyone feel the same way? Do you have any miraculous stories about dua to share? Plz do.