Request your web hosting provider to increase your monthly bandwidth. You need to upgrade your hosting plan.
Upgrade your web hosting plan to a higher monthly bandwidth. There are also some tips to save bandwidth of your blog by probably installing a plugin that would lazy load the images on your blog it will increase your site's loading speed and save bandwidth at the same time.
Upgrade your hosting, but if you really want to minimize bandwidth, in addition to what others above have said, look into enabling gzip compression on your blog.
The only ways to reduce the bandwidth used (assuming that the site already uses compression) is to either reduce the amount of data sent to the user (in other words, less content) or reduce the number of users. Neither one is what you want, unless you're sending way too much data for the content - which probably more than half the websites in the world do.
Use caching and compression.Also if you are proving any files for download upload the same in places like mediafire instead of giving a direct link from your website.Hope this helps
You can ask you web hosting service provider to increase it or you can upgrade your plan to get more bandwidth.