Although we might take this advise positively, I guess it is still to vague for the average joe/jane.
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I agree with that.
Instead of advicing average Jeph and Jane to invest in Bitcoin, send them some of the lesser known but amazing facts about Bitcoin.
This can start by providing a few links to Andreas Antonopoulos talks, or just sending them some other informational but intruiging resource.
Or, even better, let them download a wallet, send them a few funds while you are on the other side of the globe and let them experience the ease of use and direct, decentralized manner of Bitcoin themselves.
A healthy Bitcoin journey shouldn't start from a greed-based but uneducated point. Sure, if they are lucky and ride that first big wave possibly coming in 2024 well, they will be excited. Until the correction comes and then the journey usually ends there because "Bitcoin is obviously dead now".
Still, glad you mention dollar-cost-average and your second point isn't too bad either. : )