As someone who just started I can imagine splinterlands is currently super difficult to level up, but on the other hand you do get rewards currently with the FP and the RP which also will give chests with cards in there.
I dont know what is wisdom honestly, I am just happy I started a lot earlier and am still plucking the fruits from this
you only get those rewards if you use cards you own. If you look at the screenshot in the post you will see reward reductions - starter cards 100%. Now it is only possible for established players or new players willing to buy a lot of cards to earn.