Hey there! While we're happy to help with cPanel issues, it's usually best to work with a site admin to try and get everything optimized as best as possible. I did see your domain name before I edited the thread and there were many good details found at GTmetrix | Website Speed and Performance Optimization
if you perform a site scan there. That analyzes the site to see what specifically takes things longer to load, and recommends some ways to improve it.
We also have an article of our own here that may give you more details:
Having a fast website is essential for any business as it can sometimes affect how a website may convert visitors into customers. This will touch on some of the more common reasons why the Time To ...
but there aren't going to be any options on the cPanel side that will directly improve the TTFB values.