I'd first spend money improving the spelling and grammar across your site... https://www.hackerearth.com/recruit/source/ https://www.hackerearth.com/recruit/so

I'd first spend money improving the spelling and grammar across your site... https://www.hackerearth.com/recruit/source/ https://www.hackerearth.com/recruit/source/ for instance, at the bottom under past challenges has a lot of spelling and grammar errors. Hire a US-based copy editor. Also why not advertise on careers.stackoverflow.com? Or stackoverflow itself in certain markets, is probably more cost effective and targeted than your google ads.