First H1 - This Should Stay as H1

This is some content under the first H1.

Second H1 - This Should Become H2

This content is under what should become an H2.

Regular H2

This is a regular H2 that should remain unchanged.

Third H1 - This Should Also Become H2

More content here.

Regular H3

This H3 should remain as is.

Fourth H1 - Another One That Should Become H2

Final test content here.