The range you're seeing isn't actually as scattered as it seems - there's real logic behind those numbers, it's just that contract rates depend heavily on what you're actually doing and who's hiring. A junior contractor doing basic vulnerability scans or compliance audits might genuinely land $50-70/hour, while someone with specific certifications (OSCP, CISSP, that kind of thing) or deep experience in a hot area like cloud security or incident response can pull $120-150+. The wild card is whether you're going through an agency or direct to clients - agencies take a cut, sometimes a big one, so you might see $80/hour posted but only pocket $55 after they take their percentage.
Your 4 years of IT support is actually decent groundwork, but you'll want to be honest about what you can credibly market. If you're thinking of jumping straight to pure cybersecurity contracting, most serious clients want to see some specialized certs or a track record in security-specific work. Some folks I know transitioned by starting as a contractor doing what they already knew well (systems admin, network stuff) and gradually took on security-adjacent projects while getting certifications on the side. That tends to work better than trying to rebrand overnight.
The other thing that matters: are you accounting for gaps between contracts, taxes, benefits, and all the stuff a company used to handle? Contract rates look great until you realize you're not getting paid during downtime and you're covering your own health insurance and taxes. Plenty of contractors end up making less per actual hour worked than they were salaried, even at higher quoted rates. Run the numbers both ways before you jump.