Nearly every abandoned account was posting daily six weeks before it stopped. The pattern is so consistent it is worth designing against directly.
The trap
Cadence gets chosen during a burst of enthusiasm, when everything feels possible. It then has to survive illness, deadlines, family, travel and the ordinary weeks where nothing is interesting. It usually does not.
Design for the worst week
Pick the cadence you could maintain during a genuinely bad month, not an average one. For most people that is two or three posts a week, not seven. Then treat anything above it as a bonus rather than a baseline you have failed to meet.
Build a buffer
Four finished posts in reserve changes the entire experience. Bad week, illness, holiday — the buffer absorbs it and the rhythm holds. Building it requires one uncomfortable weekend and then it maintains itself, because you only need to make what you spend.
Batch by pillar
Making four posts of the same type in one session is far faster than four different ones, and usually better, because you warm up. This is the practical argument for having defined pillars at all.
Separate making from posting
Two different modes of attention. Trying to write, film, edit, tag and publish in one sitting is why posting days feel awful. Make on one day, publish on another, and the whole thing gets lighter.