Regarding group plans, they are not always cheaper.
For example, if you work for a small company and one or two people have huge claims for themselves or their dependents (such as children with diseases or disabilities), the group plan will spread out the coverage costs across all of the employees.
When I was younger (well before ACA kicked in), I worked for a 25-person company and one of the executives had a kid with down syndrome. It turned out to be cheaper for the company to buy an individual policy for his child rather than include her on the group plan as a dependent, so the company did that and paid for it.
The real issue though may not be a few people but a department of people. For example, your work may be in a safe and secure place, but if your company employs a lot of construction workers or people who work in high risk positions, it's possible the costs of their coverage is being spread out among those who are very low risk.
That's the guiding principle behind health insurance though is that the premiums paid by those who are healthy and rarely use their insurance help offset the coverage costs by insurance companies for those that have large or several claims each year.
Again, I'm not an expert by any means, but my guess is you are stuck with your current insurance policy until open/re-enrollment starts in late 2020. Even if that's the case, you should shop around before then to see what other similar individual policies will cost you. You may find they are the same price and/or more expensive or you may find they are much cheaper.
Of course you could cancel your policy and assume the risk that nothing serious will happen until open enrollment starts, but that's a huge risk in this day and age.
I would never recommend going without health insurance though.