[Amresh]

hey why don't you use cloudflare....their network provides good security to your vps....maybe your vps then be less vulnerable from botnet attacks or ddos attacks!!
also, if you use ssh then stop using your default ssh port i.e. 22....
you should change it to something else if you haven't did it till now!!
......Also, if you are using centos then stop using it and switch to CLOUDLINUX (if you want your vps for cpanel hosting!!).....
......use latest php for cpanel hosting.....old php has several vulnerabilities.......
......Even you can do more by visiting here:- https://www.accuwebhosting.com/blog/15-e...el-server/