Hello Sir,
Did you set up SMTP in Contact Form 7? If not, please configure SMTP first and then check if it works. We recommend using this plugin: https://wordpress.org/plugins/wp-mail-smtp/.
About the issue with your blog posts, are they all in the same category? If so, maybe only one post is showing on the homepage. Try changing this to see if it helps.
If you’re still having issues, you can give us temporary access to your site, and we’ll safely try to fix the problems for you.
Thank you,
BoomDevs Support Team