Hi aspirant, since you have 30000 ews rank in JEE Mains so in behalf of this rank below I'm mentioning the colleges you can get on this rank in Delhi region;

• Ajay Kumar Garg Engineering College
• Galgotias University
• Maharaja Surajmal Institute of Technology
• Maharaja Agrasen Institute of Technology
• Netaji Subhash University of Technology
• Bharti Vidyapeeth College of Engineering
• JSS Academy of Technicaln Education
• Jamia Hamdard University
• Indra Gandhi Delhi Technical University

Etc.

For predicting more colleges I would like you to refer you college predictor tool by careers360(link mentioned below);

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Good Luck.