From what I’ve seen about how other players more or less define Elo ranges, I’ll go ahead and share my take on this:
1100–1200: Basic understanding of game mechanics. Basic/slow boom. Weak player, needs a strong carry to guide them. Poor game sense. Weak micro / low combat skill.
1300–1400: Intermediate understanding of game mechanics. Decent boom most of the time. Strong if left to boom, but probably weak against rushes. Limited ability to improvise. Decent game sense. Can rush, but at a high cost to their boom. Can have good micro / combat skills. Needs to be carried most of the times.
1500–1600: Advanced understanding of game mechanics. Consistent boom. Decent defense against rushes. Good ability to improvise and read the game. Can rush, but at the cost of delaying their boom. Good micro / combat skills. Can act as a carry in some matches.
1700+: Advanced understanding of game mechanics. Boom is always effective. Strong defense against rushes. Excellent improvisation and game sense. They can rush without significantly hurting their boom. Excellent micro / combat skills. Can always carry. Capable of deciding the outcome of the match.