As a bronze league hopeful, is it better to focus on one race or should I keep playing as random?

Play the other races.

Sure, you might be able to advance your score faster by focusing on one build, but you're also a lot more likely to become bored. At the bronze level, the most important lessons you can learn are transferable between races, like building workers (build a lot, and keep building), building buildings, expanding, and keeping pressure up.

If you feel that this is too hard, or playing all 3 races is too much, then I recommend you focus on either the zerg or protoss and terran. Z plays very differently from P/T and you might run into frustration if you try to play Z the same way as you play P/T.

I recommend you choose a specific race, and focus on one technique/strategy at a time. E.g., try to do a rush on (almost) every map for 10-20 games. Then, do wall in at natural on every map...

Of course, adjust this to the map and what your opponent is doing - but in general I think you'll have a much easier and faster chance to learn the techniques. Switching races all the time will just confuse you at first.

Yes, you might/will drop if you switch races once/if you're in platinum. So what? Mistakes are a great teacher, you'll learn a lot even if you don't win.

Honestly, I'd say play random for a few dozen games, then pick the race you're most excited about. Now, commit to that race and work towards advancing up the ladder. After a few hundred games, you should be pretty familiar with your pick and could probably start playing as random every now and then.

This way, you:

• Learn the solid mechanics of a single, well chosen race.
• Can always have your studied race in your back pocket.
• Can rock it when you get it, or counter it effectively when your opponent plays it.