וּשְׁמַרְתֶּ֗ם אֶת־דִּבְרֵי֙ הַבְּרִ֣ית הַזֹּ֔את וַעֲשִׂיתֶ֖ם אֹתָ֑ם לְמַ֣עַן תַּשְׂכִּ֔ילוּ אֵ֖ת כָּל־אֲשֶׁ֥ר תַּעֲשֽׂוּן׃ (פ)
所以你們要謹守這約的話，並且遵行，好使你們所做的一切都亨通。
Ibn Ezra
The verb achieve is in the hif’il form, like the word “succeed” [Jeremiah 32: 5]. It is a transitive verb with both a direct and an indirect object, as evidenced by the word you do. Compare, “David achieved in all his endeavors” [I Samuel 18: 14].
Sforno
ושמרתם את דברי הברית הזאת, the one you will accept at Mount Gerizim and Mount Eyval.
Chizkuni
ושמרתם את דברי הברית הזאת, “observe therefore the words of this covenant;” you are obligated to do so in light of all the favours the Lord has done for you as recorded earlier.