Enhance Website Functionality

I’m looking to refine the feature set on my existing website so it works harder for both visitors and for me behind the scenes. The design, layout, images, and copy are all staying as-is; what I need is targeted development that adds or improves the site’s core functions... (Budget: $30 - $250 CAD, Jobs: API Development, Backend Development, HTML, JavaScript, PHP, Python, Web Development, Website Design)