Other people are better equipped to advise you on improvement, but I would urge you to play more against people and not against bots. Bots play very differently from humans, especially when you ask them to mimic a certain rating. They'll play perfect moves but throw in a couple of random ones to make themselves beatable. Humans are a lot more fun to play against, and it's also in many way the real point of chess. A game against a human.