Why is such big difference between G5/4 vs G2/1?

I just got to g2 (i am in promo for g1) and the games are a lot harder (i played kinda 20 gmaes in G2)! As i climbed from s2 to g4 I saw no difference between ranks, but now everybody knows how to play! Is so %%%%ing annoying! G2/G1 is still low elo, I was surprised to see people playing so good. I still win games and have a decent winrate but I cant carry so easily anymore how I used to! Is just me or really exist this gap?
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