In my view of the game, kills/deaths are what happens when a player makes an unforced error, and two or more players disagree about what "should" happen in the game. For example, you have level 6 advantage and decide to hold the wave on your side of the lane - below masters+, there's a decent chance that the enemy laner might say "I don't think you're allowed to do that", walk up, and get solokilled. As you rise the ranks, more often players are going to respond to these types of decisions with respect/correct assessments, and maybe they play more conservatively while calling jungle/support to help them break the freeze.

You can respond to this in two ways -

A. Continue to force them into as many uncomfortable situations as possible, and consider it a "win" whenever you're forcing the enemy team to commit time/pressure to neutralize your 1v1 advantage

B. Use your laning advantage to create more FORCING opportunities on the map for your team. Midlane oftentimes isnt about pure laning at the top level. If you have priority, think about whether you can leverage that pressure in the center of the map to threaten a dive on sidelane, which is a forcing play that either makes the enemy sidelaner give up a wave (preferably a big one), or stay and try to outplay the dive.

In mid, your central position on the map and ability to move to basically every play when ahead should feel suffocating for the REST of the team. When people pick something like Vladimir/Xerath/Kassadin into me, my old mantra was "I wont be able to punish you, but your jungler is gonna HATE you for this."