A full sentence would be helpful, as would some context. What are you planning in using this in, Rise up? On account of is being used correctly (as far as I can tell), but for me, it's a pretty casual-sounding expression. There are contexts where I would use it, but contexts that I would not.
I don't really like any of the options you've provided.
"On account of" is closest to your meaning, but I agree with JustKate that it sounds casual.
"Due to" and "owing to" sound as though you're blaming your interest in languages for your choice of degree.
"By virtue of" is just wrong.
I would say "Subsequently, because of my special interest in languages, I obtained a degree in philology." (We don't say we "studied" a degree. If I had entered the degree program in philology but not actually completed it, I would say "I studied philology.")