The job aspects which you listed are more aligned with support roles rather than technical sales / presales / solution architects. On the technical sales side, there's less time spent exploring / troubleshooting compared to presenting what is already built. Some companies have overlay technical sales teams which act as SMEs for technical sales where there is more time spent exploration and troubleshooting and less time spent doing basic demos.
One constraint that you need to be mindful of: salary. Support roles do not pay particularly well if your goal is to live a middle+ class lifestyle. Happy to chat with specifics from my experience if you reach out. I see that you live in Sweden where the upside for technical sales from a salary perspective is lower than in the US.
> I am just much more comfortable supporting existing software than building new software.
Having technical skills is required, but you'd be doing little to no coding or design work.
> Being an interface between business and tech.
A sales engineer matches this almost by definition.
> Just working with people in general!
The job is essentially entirely about working with people, both with the customers you're trying to sell to, and with the developers who are actually making the product.