Keeping up with anything in the long term is hard. Even when you think you've established a certain routine, that routine can very easily turn into vapour when you least expect it. You put that routine down on the table for a minute, and go take in the sunshine, or go for a paddle in an inflatable kayak, or watch the new season of that one show you really like, and next thing you know nearly a year has gone by since you last updated the old weblog.
Well, what is anyone to do? Sometimes you get stuck, and there's no sense in beating yourself up over it. Just get back to it.