Idioms: search my heart, come close to home, count yourself lucky...

[Alimysoul]

hi everybody
can anyone explain to me this idims
(1)search my heart
(2)come close to home
(3)count yourself lucky
(4)cross my heart and hope to die

[Mister Micawber]

.
1-- Not an idiom, to my mind.
2-- Strike nearby
3-- Consider yourself fortunate
4-- I solemnly promise
.
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Native English teacher at Mister Micawber's