Which strategy to choose?

Link building and constant posting go side by side. If you are getting good views then keep on posting regularly before you start building links but if the traffic is not much then link building can help you in bringing more people to the blog. However link building will benefit you if the content is good enough that the viewer is compelled to visit your site again.

Go with option 2 create more content and at the same time you should building links by yourself, there are many guides here for this, it's not necessary to spend money on it.