There are two types of authorities. Domain Authority (DA) and Page Authority (PA). None of both authorities depend on the number of pages you have in your site. Instead, they depend on your Search Engine Optimization (SEO).

Optimizing your domain for search engines include:

Finding and using your niche targeted, short and easy to remember domain name. At least not more than 14 characters. It reduces the number of times people mistype your domain name and land on another website instead.

Getting backlinks from other authority websites in your niche with already higher link than your DA through guest posts and more. It tells Google that your site is also important as those sites based on recommendation and gradually your DA increases from that.

Hosting your website for longer period at a go, for example 4 years or more, instead of 1 year. It tells Google that your website is here to stay and it helps increase your ranking higher than new similar websites like yours hosted for less number of years.

Running your website for multiple years. The longer your website is online and active, the more your DA ranking increased. Whether hosted on a go, or renewed every year, it don't matter.

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Optimizing your page for search engines include:

Doing keyword research to find out the keywords with less ranking difficulty that you can easily rank for and attract more visitors to your...

Choosing a focus keyword for each of your posts and ensuring you don't repeat focus keywords you have used before in your other posts.

Including your focus keyword in the title of your blog post, your meta description, and in some of the sub-headings of your blog post.

Using shorter and more precise titles. Adding the year of the post could help but don't over do it or use it on all your posts.

Writing each of your blog posts to be over 300 words. The bigger, could be the better if it offers more value.

Including images to enhance your blog posts and adding alternative texts to the images so users and Google know what should have been there even if the image is missing for any reason.

Adding tags related to your post on the tags section.

There are more, but doing these on all your posts, can surely help your site rank up within some time.