Website Hack by harmful code injection. What to do?

Hello , Everyone my website https://wwww.24techsupport.in is being infected by harmful codes and this is 2 time my website face this. I had remove harmful codes and comments but i am in fear of again hacking issue so please help me for securing my website. I install wordfence but it helps in finding harful code but it is not securing my site properly and thats it is hacked by second time.