When I was an employer of hundreds of highly educated people I drew a distinction between those with the highest technical skills and those who could show, possibly, but not necessarily, through having acquired qualifications, that they could apply themselves to new challenges. I was not particularly impressed by a long string of university degrees unless I could fit the holder into one of those two categories.
You have to decide how you are to sell yourself to future employers. They will mostly be interested in what you can do for them. Your degrees will help them place you, but you have to decide first how you want to place yourself. 28 years is not all that old if you have something to offer in the future, but do bear in mind that by definition a university degree is about what you have done in the past. It is evidence, but not proof.