Sentence examples for up to this from inspiring English sources

"up to this" is correct and usable in written English.
It is typically used to refer to a specific point or moment in time, often in contrast to something that happens afterwards. Example: - Up to this point, the meeting had been running smoothly, but then things took a turn for the worse. - I've been following the instructions up to this step, but now I'm not sure what to do next. - This job is up to this date the most challenging I've had, but I'm determined to keep pushing myself.