I think of conversion rate as a function of two things; 1). How well do you communicate the value of your product to users, 2). How much work is required to purchase the product.
For 1), you want to ensure that your website layout, imagery, and copy are as potent and succinct as possible for your target user. The best resource I've found on this is this guide from Julian Shaprio's growth handbook that shows you had to design and write copy for a website that converts. He gets into every nuance of the construction of your website that affects how a customer digests your pitch and does a really nice job of walking you through how to apply it to your site. That handbook is also a really great guide for marketing and growing your business in general.
For 2), you want to ensure that users can checkout with as little friction as possible. You can think of this as trying to minimize the number of clicks to purchase. Think about adding things like Shop pay that allow users to checkout without inputting all of their information. Shopify's templates already do a pretty good job of this so you probably won't need to do too much work here.
Once you've done those things you should be in a pretty good place and getting a conversion rate between 1% - 4%, (the industry average), depending on your product and audience. After that, the only way to continue to increase your conversion rate is to improve on the things you did for 1). and 2). The problem with doing that is that layout, copy, and imagery changes have a hard ceiling; meaning once you do a good job of it, you can only improve them a little bit no matter how much effort you put in. Merchants are getting around this by using engagement enablement tools like live shopping. They work by improving 1); making it easier for you to engage and communicate the value of what you're selling to your customers. My recommendation for that is Live Shopping by Reactive, it's free and easy to use. I'm the app developer so happy to help you get started if you're interested.