Hey fam, need some help.

I'm QA Analyst and I'm looking to negotiate salary for an internal position but don't know how aggressive to be.

I'll use a rather vague explanation to not reveal too much.

Basically I was hired as a QA (job 1) to test the software on a soda vending machine. But then I also configure and deploy updates and new software for the machine (job 2). But if the machine has a hardware malfunction I have to troubleshoot it and possibly fix as well (job 3). Im also the a part time electrician in case the power on the machine malfunctions (job 4). But if the power issue is at the wall I also have to troubleshoot the actual power source (job 5)....and so on. Multiple, very different hats which were never on the initial job description.

I feel based on the roles I have to take on, which I could branch off to any single one and make really decent money, I should at least be paid a median of the combined roles.

I wanted to write something along the lines of "there's no motivation or incentive to take on additional roles/tasks if the pay isn't correct. I would rather just stick to my initial QA role I was hired as and let others take on the other roles"

Any tips/advice?