Dear Supriya

you got very good rank in JEE MAINS 2019 but CSE, ECE and EEE are the branches of very high cut off's so getting these branches in top NIT's is very difficult you can choose other branches and I personally recommend you to write JEE ADVANCED 2019 you may get a good IIT . 

or you can check previous years cut off's of NIT through the link that i am providing you below

https://josaa.nic.in/josaaorcrarchieve/Result/OpeningClosingRankArchieveN.aspx?enc=N9lE47fIvQCtn+Sq4k3AR/PB9WcjYR9Ghf4gYFx/r3w=

All the very best for your upcoming journey an hope this will help you if not you can comment below

Thank You!!