This is the 4551st most frequent Polish word.
lepszych
"Better" (genitive or accusative plural form).
The word "lepszych" is used here as an adjective in the genitive plural, describing "okolicznościach" (circumstances).
Mam nadzieję, że spotkamy się w lepszych okolicznościach.
I hope we meet under better circumstances.
"Lepszych" functions as the genitive plural form of the adjective "lepszy," qualifying "sposobów" (ways).
Szukam lepszych sposobów na naukę języka.
I am looking for better ways to learn a language.
Here, "lepszych" modifies "win" (wines) and is in the genitive plural to correspond with the numeral "kilka."