I have crl 2814 and obc rank 690 in upsee 2019....i expect cse at iet lucknow but it was not alloted to me in first round of counselling...

Yes, obviously you have scored very good rank in UPSEE. You should go for IET LUCKNOW.  As you have very good rank you can get admission in their College . You should go for this College in coming round. You will definitely get chance for this College. Go through this College by visiting their website. You can choose this College as per your rank. Do your counselling properly. Give your preference to this College based on your rank. You can choose BIET JHANSI, KNIT SULTANPUR . These are the top government Colleges of UPTU. These Colleges are too much good in terms of placement and academics.