Store all of your options in a single serialized array in the database

serialize-options.php

/**
 * Register a single setting to store all of your options in the database
 */
register_setting( 'myslug_option_group', 'myslug', 'myslug_sanitize_options_array' );

/**
 * Define each of your settings
 */
add_settings_field(
	'name',
	__( 'Name', 'textdomain' ),
	'myslug_print_text_field',
	'page_slug',
	'section_slug',
	array( 'slug' => 'name' )
);
add_settings_field(
	'birthday',
	__( 'Birthday', 'textdomain' ),
	'myslug_print_text_field',
	'page_slug',
	'section_slug',
	array( 'slug' => 'birthday' )
);
add_settings_field(
	'job',
	__( 'Job', 'textdomain' ),
	'myslug_print_text_field',
	'page_slug',
	'section_slug',
	array( 'slug' => 'job' )
);

/**
 * Print each of your settings using brackets to nest this value
 * under your setting, eg - myslug[myoption]
 */
function mysql_print_text_field( $args ) {
	?>

	<input type="text" name="myslug[<?php echo esc_attr( $args['slug'] ); ?>]">

	<?php
}

/**
 * When sanitizing the values, you need to loop over each value and
 * ensure it's sanitized. Be strict here, so no one can pass extra
 * settings fields
 */
function myslug_sanitize_options_array( $value ) {

	$new_value = array();
	foreach( $value as $id => $option ) {
		// Sanitize each setting and add it to $new_value
	}

	return $new_value;
}