Juraj is on point, you have to love architecture first. Harry mentioned Tadao Ando, interestingly my favorite architect. A self-taught architect, but even though he wasn't trained formally, he apprenticed with a builder for years. 10 years ago, it was common to see CAD/VIZ/BIM people with little or no architectural background. Employers hired based on software expertise.But that mindset has changed, in part due to arch grads who are well versed in CAD/Viz softwares coming out of school. CAD/Viz/BIM is no longer a plus, it's a must for these guys. Some architects, at least those I've worked with, prefer visualizers who speak their language. It helps if you can give valuable input in terms of proportion, scale, etc. But be mindful of their ego. There are firms (the larger ones) with a dedicated viz team, that's probably your best bet. For mid-sized firm, they'll probably expect you to do other things when viz jobs are in a lull. Hope this helps and good luck.