Lets first look at what was the cut off in previous year (General category)
AIQ Cut Off -

Govt. Medical College, Kozhikode - 632
Govt. Medical College, Kottayam - 599
Govt. Medical College, Thiruvananthapuram - 614
Govt. Medical College, Thrissur - 595
Govt. Medical College, Ernakulam - 589
TD Medical College, Alleypey - 593
Govt. Medical College, Kollam - 563
Govt. Medical College, Manjeri - 585
Govt. Medical College, Yakarra - 581
State Cut Off -

Govt. Medical College, Kozhikode - 583
Govt. Medical College, Kottayam - 597
Govt. Medical College, Thiruvananthapuram - 608
Govt. Medical College, Thrissur - 590
Govt. Medical College, Ernakulam - 583
TD Medical College, Alleypey - 583
Govt. Medical College, Manjeri - 584
Seeing at these cut offs and keeping in mind, cut off varies from year to year, I would suggest you to score 600+. 600+ would be a safe score with which you can obtain a Govt. Seat in Kerala under General/Unreserved Category.
For complete details visit - https://medicine.careers360.com/articles/neet-cutoff-kerala

As per this your marks 460, is not well enough for a government seet

But you can try a private one, You need to fill your choices carefully and keep a close watch over the whole counseling process as to when n all the counseling rounds r happening,their reporting time and all.And also you got to check the respective sites of the college for information regarding the manual rounds.Its not gonna be an easy process .You can try for the colleges in South India because they might be charging a high fee but they provide quality education and have proper infrastructure (such as Shree Ramchandra 22lakh +,A few colleges in Kerala, Karnataka and a few in Pondicherry).For more information check the respective sites and last year statistics and you might be able to get an idea