best tip to get into diamond?

git gud

{quoted}

git gud

This is the short version.

The more detailed version:

• git gud at scoring the killing blows on minions
• git gud at resource management (depending on champion)
• git gud at map awareness, including placing wards and buying control wards
• git gud at rotations
• git gud at killing the fucking nexus

win more than you lose

I don't do ranked nor am a diamond player but know you cant go wrong with playing with friends as dedicated as you are. My relevant experience is you will climb to higher elos and have more success if you just hop on discord with someone who plays a synergizing champion to yours and you just practice and cooperate on the daily. Solo que doesn't exist and this is a team game, so obviously enhancing your team work is going to be one of the most broken advantages you can acquire.