There are several synonyms for "got upon" that can be used to add variety and nuance to your writing. One option is "climbed onto," which conveys a sense of physical effort and determination. Another possibility is "boarded," which implies the use of some kind of vehicle or mode of transportation. You could also use "ascended," "mounted," or "scaled" to describe the act of getting upon something. Each of these options brings its own connotations and shades of meaning, allowing you to tailor your language to your specific needs. By using synonyms for "got upon," you can add depth and richness to your writing.