We have seen some ways to humble yourself: seek lower positions, rather than higher ones; and submit to God's ordained leaders. Now, here is another one: admit that something is wrong.
The previous verse shows the context: 2Ch 7:13 If I shut up heaven that there be no rain, or if I command the locusts to devour the land, or if I send pestilence among my people;
God told Solomon that if things were going badly, it was because God was not blessing His people. God wanted His people to respond by admitting that something was wrong, not pretending that everything was all right. If there were a drought, God didn't want His people pretending that everything was fine, because there was still water in some of the wells. When locusts devoured the land, He didn't want His people to pretend that everything was fine, because indoor plants were still growing. When people were dying in an epidemic, He didn't want His people pretending that everything was fime because someone just had a baby.
When people aren't getting saved, and Christians aren't growing, God doesn't want us to pretend that everything is all right. He doesn't want Christians to pretend that things are fine because they hold leadership positions. He doesn't want churches to pretend that things are fine, because they are giving spare money to the poor.
God wants His people to admit that something is wrong, humble themselves, and turn in the right direction.