Can I succeed without link-building?

Off course, Increased Website Traffic

Yes, you can still achieve success in SEO without actively engaging in traditional link-building strategies. By focusing on creating high-quality, valuable content, optimizing on-page elements, ensuring a positive user experience, utilizing social media, and building relationships within your industry, you can improve your website's search engine rankings. While links can be beneficial, other factors such as content quality and user experience also play crucial roles in SEO success.

Note: But still I will recommend you to create quality backlinks on high DA sites with quality content....

If your niche is overfill you cant.

it might not be possible without link building and Seo.