There's no such thing as free traffic! Even SEO/Social media costs money to do. You need to invest in content production and promotion.

Blog Commenting, Guest Posting, Social Media Promotion, Social Bookmarking, and on page SEO optimization are the best options available to boost traffic. Traffic exchanges are useless.

OnPage and back linking are increase traffic.

Social Mediums are the best source.

What you did here is a way too😀

Use social media and blog submission

Pay Attention to On-Page SEO.
Target Long-Tail Keywords.
Start Guest Blogging.
Invite Others to Guest Blog on Your Site.

Blog posting
social media

Advertise. This one is so obvious, we're going to look at it first. ...
Get Social. ...
Mix It Up. ...
Write Irresistible Headlines. ...
Pay Attention to On-Page SEO. ...
Target Long-Tail Keywords. ...
Start Guest Blogging. ...
Invite Others to Guest Blog on Your Site

u need to use social medias

Use Facebook, Instagram, Twitter and another social media.

Google Organic Traffic is the free traffic you can get through SEO, and I would also like to suggest to you that if you are using different kinds of social media platforms like Facebook, Twitter, Instagram, etc., then I would like to tell you that you should add a bio with a website url. When people check your profile, they will also click on your website, and through this way you will get free traffic.