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Yeah it's called a rockoon! https://www.wikiwand.com/en/Rockoon You get the benefit of altitude, but not of horizontal velocity.

That's currently impractical with large rockets but there's one smallsat launcher which looks like it's making a serious bid to launch that way.

http://www.zero2infinity.space/bloostar/

The low pressure lets them get away with toroidal tanks, pressure fed booster engines, and a relatively large faring. Or at least that's the plan, they haven't launched anything close to orbital class yet.

Here are some interesting ideas: https://en.wikipedia.org/wiki/Non-rocket_spacelaunch

https://what-if.xkcd.com/58/

The point isn't to get higher up, the point is to get out of the damn atmosphere so you can use wider bells, lower chamber pressure, and lighter weight tankage.