I have a granite burm. I've had her for a year (she was about idk a year or two when we got her from a pet shop) and she was three feet long when we got her. Now she's nearly 7 foot long. They grow quick! She had her first rabbit on new year's.
We are now in the process of buying an 8ft vivarium, as she is growing out of her 4ft, which is going to cost about £300.
Male burns are often a lot smaller than females, I've recently seen one on Facebook that is about 16ft long
Even though my burm is only 7ft long, she has already tried to strike out at the dog when I was holding her. If she were bigger I wouldn't be surprised if she could eat one. I mean, there are videos on YouTube of burmeses eating crocs and stuff
As you have only had one snake, and have little experience I would say no to getting one. Only because they are big and powerful animals and setting them up and feeding can be a expensive.
But I can't make this decision for you, do research and you decide if it's a good snake for you