積 pile up

I condemn you for letting the wheat pile up too high! It is just reckless.

Since 積 is a `SAME-ON` kanji, I won`t bother making an ONyomi mnemonic.

active, enterprising ★★★☆☆
積 (pile up) + 極 (extreme) + 的 (motivation / '-al') = 積極的 (active, enterprising)

(adjective): enterprising, (adverb) :positively, aggressively. Someone who is really active and getting shit done and having opinions and stuff.

area ★☆☆☆☆
面 (front surface / face) + 積 (pile up) = 面積 (area)

area, like square meters.

accumulate. ☆☆☆☆☆
蓄 (store or put aside) + 積 (pile up) = 蓄積 (accumulate.)

accumulate. Used about bad things mostly - bills or stress piles up. Similar to 止まって来た (とまってきた） or 重なる (かさなる）。 But 蓄積 can also can be good, like the compound interest or accumulated knowledge.