The ‘color balance rgb’ module was created to do all things like saturation / vibrancy and more. And had a preset to add ‘basic colorfulness’, and new ones. You could try that.
(Basically, it was determined that saturation was not what filmic was made for, so it was separated, IIRC).
Although color-balance-rgb has a lot of tools, there is a general ‘global chroma’, ‘global saturation’ ‘global vibrance’ so quickly add something like this.
And, like @priort said, you can always switch filmic back to v5 mode in the tools/options tab (don’t know the exact title) if you can’t live without it.