Summer Baseball 18u after Senior Year of High School

Unless there is known summer leagues outside of my knowledge, that take high school position players.

Have you looked into other collegiate baseball leagues like the Alaska Baseball League?  And there's other leagues like Puget Sound Collegiate League and many more on the west coast.  You should have a talk with your upcoming college HC and see what he might suggest and what he might be able to do for you.  

Have not looked into the Alaska baseball league, wondering if there is any leagues in the midwest or east coast that take high school players. The PSCL takes pretty much only community college guys and would not be a step up from my current competition. HC reiterated that the leagues they have good connections with would not be something to bet on as they are filled with mostly current d1 california players and big time pac 12 recruits.

A couple of good 18 u teams that have a national rosters-Midland Redskins, Utah Marshalls, Ohio Warhawks, Bayside Yankees.