qgis - Producing smooth and consistent contour lines from SRTM

I downloaded and merged together a set of SRTM imagery. I am not sure whether it is my workflow, the actual terrain in question or if the scale of the imagery is simply too large to obtain smooth

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Photogrammetric terminology: fourth edition - Granshaw - 2020 - The Photogrammetric Record - Wiley Online Library

Creating Contours from DEM using QGIS — open.gis.lab

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Creating Contours from DEM using QGIS — open.gis.lab

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