You didn't mention whether you work from a Windows PC, Apple PC, or Iphone/Ipad or Android phone/ tablet. The simplest answer will probably vary by the system in use.
There are many image resizing tools available but most of them are focused on the image quality, resolution or pixels rather than simple file size. They all can reduce the size, but it isn't always easy to figure out how to get the size you need. A couple, though, let you specify the desired file size and the tool figures out how to do it.
Here is one free, online (web-based) tool that can work with size parameter only. Upload your image file to it and give it the resize target and it produces a file that can be saved (downloaded) as a file of the desired size (or less).
https://imageresize.org/