Personally I had always had a deep interest in automotive industry, formula 1 and space technology. I always enjoyed understanding how different technologies worked. So I had planned to do engineering really before I fully understood university degrees. But I knew i wanted to work on technical development of these systems.
If you genuinely don’t know what to do, you don’t have to get a degree. You can start a degree at any age, so another option is go work 2-3 years, save up a lot of money - then go to university once you decide what interests you.
Of course there are alternatives to degrees such as apprenticeships (including “degree apprenticeships”).
If you really want to pursue academic qualifications then id focus on what are your interests, what do you enjoy (in your free time do you watch any documentaries/read news articles/follow stories relating to something…). This may indicate your passions and you can look at potential careers in that area then the degrees that best suit entry level roles in that industry.
If you are really stuck and have skills in an analytical area, then degrees like STEM/accounting/economics etc. are very employable but I think its best to have an interest in the degree (otherwise you risk going to uni, hating the academics .. which is a wasted experience).