"And seek, through that which Allah has given you"—from these blessings—"the home of the Hereafter," meaning: Paradise. "And do not forget your portion of the world," meaning: work in your worldly life for your Hereafter. "And do good"—in what Allah has obligated upon you.
﴿وابتغ فِيمَا آتاك الله﴾ مِنْ هَذِهِ النِّعَمِ ﴿الدَّارَ الآخِرَةَ﴾ يَعْنِي: الْجَنَّةَ ﴿وَلا تَنْسَ نَصِيبَكَ من الدُّنْيَا﴾ يَقُولُ: اعْمَلْ فِي دُنْيَاكَ لِآخِرَتِكَ. ﴿وَأحسن﴾ فِيمَا افْترض الله عَلَيْك