It's really hard to make a decent living with horses. Being someone else's employee, other than to gain experience from a successful operation, is not the way to go about it for the long haul. It's taken me most of my life but I finally figured out that to be successful in the horse business, you don't need to own horses yourself, you need to provide services or products to people who do. The most successful trainers don't own a single horse, they enjoy all those lovely, top horses that their clients bring them. They own the facilities, provide the board (that's where you can make the money) and train and show their clients horses. If you like driving, hauling can be fairly lucrative too.
I've always had a boarder or 2 mixed in with my own horses, but this past year I have had MANY boarders and really taken good care of their horses. I literally take care of them as if I owned them and their owners love that. The see me feed exactly what my horses get fed to their horses, I line 'em up and groom them every day and clean everyone's stall or turnout exactly the same. Because the drought is so bad, I am not making a huge amount, feed is ridiculous, but I can charge more than the average stable here because of the service I provide. Look very carefully for a niche that needs filling and provide that service, and you can succeed.