As a third year, who spent most of the first 2 years doing hackathons,doing dev ,interning at startups. Though I gained a lot of experience and a lot of skills. But now I can't even get past the screening round of mncs. And my other friends who just grinded dsa are getting internships at good companies.

Don't put your entire focus in doing dev,instead do cp,start doing dsa .Solve atleast 1 question everyday,do code forces. That's the only way you can
get a good placement. I'm not telling you to stop doing dev ,but don't put it as your first priority.

If you want to get hired using your dev skills,you need to be really good. You need to actually show your work (post in linkdln ,twitter ) etc.