How can I speed up the download of files from the server?

Question

Express.js

I am making a site for a creative contest, where users can upload their work, everyone can send 3 works, each of which can consist of 6 pictures (each up to 1MB) or video (up to 3 minutes) and a preview. Naturally, there are many pages on which this content needs to be loaded. And it's all loaded for a very long time, it works for me like this:

• The user uploads files to the form
  
• Files are rewritten to base64
  
• send data to server via axios
  
• base64 is written to a file on the server, and data about the work in the MongoDB database
  
• When you go to the page, a request is made for the status and nomination of works, the necessary files are found by records in the database
  
• base64 is read into the array line by line (up to 6 lines of images in one file) and sent to the client
  
• On the client, Nuxt generates components into which it throws base64 and information about the work
  

It takes a very long time to load, how can it be accelerated?