Reader is a thing in your dashboard on WP. It's used to subscribed to blogs, follow search terms and so on. You could use it to find similar blogs and build a relationship with the bloggers, a kind of informal networking. Follow their blogs, post genuine comments, and get to know them so you become part of a community.
Backlinks absolutely aren’t your best bet, they’re old school and no where near as valuable as they used to be plus they’re expensive to get from any site with any authority (remember nothing is on the internet for free).
Backlinks are not expensive - they are free! Any backlinks you pay for are devoid of value. Never buy links, OP, it's a disreputable tactic* that will not provide you with any longterm benefit, and for a small, personal site like yours would be a massive waste of money even if the tactic did have value.
In a similar vein, don't attempt to optimise your content. It's another tactic search engines will see through. For years they have placed value on content that sounds natural. Optimised content, unless done really well will be picked up as an attempt to game the system and downgraded. Write well and write often, but use natural human language, don't try to bung in loads of keywords.
The rest of Norrisskipjack 's post is not relevant to you because you are using hosted WP, not self-hosted.
My advice (as someone who has done this stuff professionally for many years) is build relationships with other bloggers; try to get links to your blog from established blogs, not just for the search engine hits, but also because a blog like yours will benefit from more personal word-of-mouth recommendations.
*Seriously, the owners of most established sites and blogs get endless spam from people trying to buy links; no reputable site will ever go along with it.