If the job market is any one thing these days, it is competitive, and those people who are able to offer the most value to any potential employer are the ones who are getting the bigger and better jobs. When already employed, the tendency for many people is to stop trying to find ways to improve his or her CV, thinking that it will happen naturally through their role at work.
Do not ever stop trying to add skills, take courses if you have the time, and always say yes to any training that is being offered by your current employer. Night classes offer a wide range of subjects so there is bound to be one to suit and this not only boosts your CV but also shows willingness on your part to better yourself, which is attractive to any potential employers.
Volunteering is another great way to bulk out your CV and it also shows willingness again. While volunteering, you will find many other opportunities present themselves to you that you perhaps would not have had access to otherwise.
Networking is a great way to help add to your CV. By attending regular networking events, you display a willingness to stay in touch with industry news in your sector and it introduces you to people who might hold the key to your next job move.
Do not be afraid to ask for more responsibility in your current job, your CV is your responsibility so make it as good as possible.