this is kinda far from that point though. seen my big belly hornbeam thread, how bushy I let it get before cutting on a couple occasions, and partially defoliating it to let light in. your tree needs to build up some vigour, it doesnt look very strong at this point. it has a powerful base and muscle trunk, the branches have a long way to go to match that image. see how bushy Mach lets his hornbeam get? and its way further ahead than yours, take note. since its a collected tree, allow it to grow out and build up some root power. organic feed and generous watering.