My advice: walk around, get some music, and just clear your head. Sometimes, you have to realize you already have ideas just waiting inside your head, whether it be past memories or reflecting on what's outside your window. The music can also help change your view, often influencing the kinds of ideas you get. For example, I listen to rock when I need action and slow songs for romance when I'm writing a story. The walking keeps you from getting bored and keeps you active so you can think a bit clearer. Hope this helped!

I dont usually go looking for inspiration, it just comes at certain times. For example, I'll see something in real life and get an idea. But google images is a great place, if your looking for build ideas you just search up pictures of what you want to build (for example: skyscraper, palace) and you can get tons of ideas.

Note pad.

Just give up on searching, get jealous by everyone else who is so much better than you, learn from how they do things and get inspiration from them.

That's what works for me xD

And with "inspiration" I mean getting inspired by the subject or the general scene, not copying the work. I am a command blocker myself and I learn from mechanics that other people use. Later on I find a new fun combination of all the things I know and start creating something again.