The average level has definitely risen since s3.
I've been to diamond back in s3 and at that time playing in silver-gold felt like an easy walk i could get away playing everything and buildging anything.
And people's build most of the times were just some random shit.
Watch streamers to learn what to do in game, but not with highest viewership, those boys there are mostly to entertain not to teach and they are also toxic.
Use to see what to build.
But yeah skill floor is high in most nowadays games.