Backlinking is very time consuming.

Outside of standard business listings and community links, you really need to create quality content that people will want to link to. Usually because the topic is relevant, and it is well written and researched. Then do outreach to make your content known.

You could also start by finding resources that are looking for people to provide content (in your niche), and reach out to do guest posts. Which it looks like you're already providing on for others on your site.

If you don't have a budget, but have the time, you can get a lot of free information on building backlinks from backlinko.com.

If you have the budget (White Hat) SEO companies that provide backlinking are great way to go. With these services you're paying for their time to do backlinking correctly. Companies that can build you backlinks will use tools such as ahrefs or semrush to identify the best opportunities.

Never pay for the backlink itself. In the short term you may get a boost, but it will do long term damage to your site, potentially permanent damage.

I assume your ultimate goal is SEO (search engine optimization) if you're looking to build backlinks. I'd start by focusing on content creation. Your site is currently a Page Authority and Domain Authority of 1.

Dedicate (or hire) someone that can provide you with longer and more consistent content than you currently have, on topics that will provide the best results (traffic).

To achieve this they should use tools/methods such as Google trends, and Google suggestions to find topics to write about. There are also paid tools such as semrush and buzzsumo.

Once you have great content, people are looking for, then you can focusing on getting people to link to it through outreach. Everyone wants backlinks, you need to separate yourself from them. Develop enough traffic and people will be reaching out to you.

I'd also recommend to enhance the effectiveness of your blog that you use lead magnets and other methods to capture user information and add them to a newsletter.

Hope some of that information helps.