There are some legal  ways to get more likes on social media accounts:

Create high-quality and unique content: Make sure your content is visually appealing and enjoyable to your audience.

Use tags: Use relevant hashtags to make your posts more discoverable.

Engage with others: Like, comment, and share other users' content. This helps to increase visibility and build relationships with other users.

Use Instagram and FB stories, IGTV and Reels: Use Instagram Stories, IGTV and Reels to increase your reach and engage with your audience in new ways.

Post consistently: Make sure to post regularly to keep your followers engaged and interested in your content.

Participate in challenges and trends: Participate in popular challenges and trends to increase your visibility and reach a larger audience.

Collaborate with other users: Collaborate with other users, especially those with a large following, to reach a larger audience.

 You can use thirty parties: Consider using free promotion to reach a larger audience and get more likes on your posts.

It's important to remember that increasing likes is not the only important thing, Engaging with your audience and building a community around your content is also important.