Try adding array( $this, 'myskills_html' ) to the third argument.
public function skillsmetabox_init() {
add_meta_box( 'myskills_meta', 'Proficiency', array( $this, 'myskills_html' ) );
}
Since this is class method, it should have the $this as well.
The same way you did with
add_action( 'save_post', array( $this, 'save_metabox_details' ) );
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