Disable that damn Welcome to the block editor message.

blocks.js

import { registerPlugin } from '@wordpress/plugins';
import { select, dispatch } from '@wordpress/data';

registerPlugin( 'disable-welcome-guide', {
	render: function () {
		return select( 'core/edit-post' ).isFeatureActive( 'welcomeGuide' ) &&
			dispatch( 'core/edit-post' ).toggleFeature( 'welcomeGuide' );
	},
} );