TransLater

Get a bike. The bike can be a cheap stand-up indoor thing, a department store special 3x5, or you can go all the way up to setups like mine with a zwift ride for indoor and gravel and road bikes for the outside. You get lean legs, lots of cardio (anti-androgens can mess with your heart, so help it out with a head start!) and they absolutely help with glutes. My BMI went from 32 to 25 in under a year with a bike and running.

Now that that's out of the way, remember that many of the places you want to become fuller and rounder are primarily fat. Hips are fat. Round cheeks are fat. The chest is mostly fat. Weight cycling is great, but not until you're on HRT. Take advantage of the before time to lose all the fat you can. The longer the brown fat cells are empty, the less likely you are to refill them after you start. You only put net new fat cells in feminine places after starting, so the fewer you have now, the better. Weight cycling (+-5lbs a month or so) works because you try to lose the weight to get the older adipose tissue to be reclaimed, then add the fat to new tissue elsewhere. It takes time. Start now with fewer adipose cells by losing the weight.