I use the Automatic Platform Optimization tool (with the official CF plugin). I do pay $20 per month for the Pro plan.

That's pretty much it, it handles purging on its own, as well as BYPASSing the cache for signed in users (required for me).

I have another site, much larger (600k page views per month) that I am also going to put behind Cloudflare this week. It does speed up by quite a factor so that's a no brainer.