>The three most basic steps in my view are gardening,
Being able to generate or even just supplement your food supply is very important, agreed.
>acquiring a firearm (that you can reliably use),
Whatever one's political stance is, a gun is a very practical and valuable tool, yes.
>and moving as far away as possible from dependence on electricity.
This one I would slightly differ. I understand the appeal of going fully off grid, but there are just too many advantages that being able to use electricity that imo, it's worth trying to get at least some electrical generation or storage option. Whether that's individual home scaled solar, wind, or gas generator hooked up to a bank of batteries to run a laptop and charge or run electrical devices including power tools.
I'd offer another perspective to think of, instead of only going all solo off grid remote innawoods option. I might instead try to develop and strengthen a network of trusted people who can be relied on in a SHTF situation.
>What do you believe to be the most likely disaster to come?
I honestly do not know, however there is no shortage of highly probable and some already happening situations that can certainly use a survivor mindset.
<economic depression, wuhanfluenza lockdown and such
<major military geopolitical event aka large scale war
<natural disaster or damage to major infrastructure
<social cohesion reduction aka riots
Personally, the large stuff scenario I'm not sure I can deal with, so I just try to prepare for at least the generic recommended "have 2-4 weeks of essential supplies in case of emergencies". As well as keep practicing my mindset to be calm cool and collected if a happening does happen, and honing my social networking skill. Maybe befriend the closest Amish community, or cowboy era or colonial pioneer re-enactor groups.