I have done what @Darren_Gough suggests and it worked quite nicely. However, I did have one manager say, “You just need to learn to multi-task better. It all needs done.” I eventually moved on from that job. I suppose I could have put in extra hours outside of the office to work on the tasks I knew were more important and then taken the results back.
I think as he notes, it’s important to be showing them though what they are missing out on by having you do this administrative stuff.
For example, if I have these 5 x things to do, that’s fine, but then y (which will provide more value) will not get done. And - for real - I go in with abstracts/research articles and wave them around when I advocate for “y” over “x” because “y” provides more value. One, I think it shows I’m really serious. Two, no one will ever sit down and read the damn article or get past the abstract anyway.
I also pull the “the best in class communities” are doing x and I don’t want us to fall behind. If you can use a time tracker to give your boss a clear idea of just how much of your time is being spent on these tasks - he/she may not realize it’s consuming all of your time.
Always tie it back to what is in it for your boss - how will not doing those admin tasks and focusing on growth/engagement make HIM/HER look BETTER? How will they meet the company goals (which makes your boss look better)?
And, most importantly, have some kind of suggestion as to who will do these tasks if your boss agrees with you. Never go in with a problem/question/complaint without having a possible solution/s or way to resolve things. Maybe this means having a college intern do these tasks for credit. Or distributing tasks among other team members (if they exist). Or taking on an entry level employee (if possible). Or a virtual assistant.
If none of that is possible, suggest a compromise - you’ll only spend x amount of your day doing these admin tasks and x amount focusing on growth.
When none of these tactics work, there’s a deeper issue at play (as @richard_millington and @Darren_Gough point out). For your own sanity, it’s critical to recognize this – because the culture won’t change. Don’t hang on and burn yourself out hoping it will get better. Pick up and move on.