Interlinking old article will surely bring a huge exposure to it There are many readymade plugins to do it like Yet another related post Interlink post SEO smart link plugins are the most widely used one to interlink articles
Hey Sudharshan, nice to see you here. Using those plugins wont guarantee you interlinking. You need to get the old articles link and place them in the relevant keywords in your new post. All this can be done only if blog on a specific niche.
Interlink is the best way to go. Bringing attention to old posts is relatively important if your blog is targeting a particular niche.