Board Thread:Plants vs. Zombies Wiki discussions/@comment-36483640-20190612051502

Just as the title says, how do I do this stuff? I want to level up my plants but I can't because of how I completed all the worlds (Excluding the hard mode) and I have nothing to do, I always lose at Battlez. I need to level up my plants up to level 4-max level. That's also gonna cost coins, how do I get a lot of coins (My coins are around 20000)? Would like some answers, thanks for reading. 