Offer Reader Encouragement at the Bottom of Each Post: Reminders and encouragement should be given to people so that they know about and can subscribe to your blogs RSS feed. You can effectively put a small message at the end of each post which states that readers can subscribe to your feed and gives them the information on how to subscribe. Since your post is already going to be interactive in nature where you commit to communicate your ideas with your readers, your little message is going to come within this flow and it won't look odd. Ultimately, what you're doing is nothing but showing your readers the benefit they can get out of subscribing to your blog's RSS feed, and there's nothing wrong in doing that. If your readers read your post and liked it, that makes it the perfect time to put out your message because they will be more receptive.
Leverage an Existing Audience: If you got an existing audience on another blog, website or any web platform then why not leverage it to get more subscribers to your blog? You can do plenty of cross promotion if you have already put the work in to building up your audiences on other platforms. And it's even better if this audience is relevant and related to your current blog. There are so many opportunities that we miss because we don't have the right level of focus. Look around to find out if there are other sources you can leverage to get your existing audience to pay attention to your blog content and what it can do for them.
Track Your Feeds: It is incredibly common to find out that you have a broken link or some other tech glitch that has rendered your RSS Feed broken and unusable. You should try and keep a check on your feed to ensure that it's working all the time, because by not doing so, you may be losing valuable subscribers that are trying to get on your list. This doesn't mean, though that all of your attention needs to be focused on this single thing, periodic checking in should be sufficient. Besides that, having a broken link or something similar may setup a wrong impression on your readers, and they may suddenly stop reading your blog looking at the whole scenario as unprofessional. You never know how your readers may react, so ensure that you're giving them a smooth experience in every possible way.
The early stages of your blog development and gaining your audience are always going to be a little bit hard and that is why you need to focus on attracting repeat visitors because that can help you balance out your traffic.