The only thing in a title that matters, is what you want to matter.
If you need it to say, Senior, that matters to you. When I was a junior, getting out of being called a Junior mattered a lot.
I struggled with being called a “Senior” because then everyone thought I had the answers (I didn’t).
At my first company, I made up a title so I had one, then realized I had to get a bit more formal when explaining who and what I did to people.
Now, I keep it simple, open-ended, I rarely use it, when someone asks, I know they are asking for what was bestowed upon me by others and not what I do.
If someone watched you for a week what title would they give you?
Would it matter?
Would it change what you are doing?
Therefore, what’s in a title?