Or you could style it as basic formal upright by wiring the longest lefthand and righthand branches horizontally, the tall one in the middle rear down to horizontal in back, give all 3 some zig-zag and just guide growth into ramification for all twigs/branches present now. It will be a nice little tree in a year and if you do nothing but continue that design it will eventually get to whatever size it would be by growing it any other way in the same time frame. Increasing nebari and thread grafting being separate issues you may or may not be up to or even willing to apply, given that it's not a bad form now, it's just untrained and young. Chopping and other drastic operations will not speed up anything. They just change directions of growth and any wood subtracted will delay wood accumulation by the same amount as what is chopped. Chop it in spring and you will be looking at today's pictured tree two years from now, except it will be shorter by some length. Bad Karma. If you like 'Taters, chop it down. Now, it's a small tree.