These days so many kingdoms only want to war where they have clear and significant advantages before the war is agreed. How many kingdoms around with 95% average opponent size...honestly the mods need to penalise kingdoms with a below 100% (98%) average opponent size.

How to find war....search and message old son. You'll message 10 (if you're lucky) kingdoms in range. Most do respond in fairness. Any below you in NW will decline. Those above might agree, but want X days to pump (explore, grow) until they are 5% larger in NW.

If you want a quick war then wave a kingdom 105% /110% of your NW size and more often than not they will press the button unless your wave is particularly severe.