I used to work in MNC consulting (big-5, tier-1 clients), but started a side gig for a friend's sme company on weekends - it kinda grew from there. I had an opportunity to get into pretty much the entire business and mess around/ optimize different aspects of it, and built systems where they were needed, and as a nice side effect developed an intimate knowledge of said business aspects. End result? I have deep knowledge of particular niche segment and in my country at least, in this segment, I can confidently say I service, or have serviced the majority of companies.

Tl;dr: keep your ears open, find a friendly opportunity and work it hard. It gets easier as you go along.