Honestly mate, it's a long shot. It may be different where you are (I'm guessing India from your username), but when I got close to the pro setup in England there's no way they would have taken on a 29-year-old they hadn't ever heard of.
There are many important details you've not included in this post such as your level of cricketing experience today, and stats, and how any applications you have made have gone already, so I have very little to actually go on.
Regardless of that though, do not give up your day job. If there's one thing I do know, it's that cricket is a fragile living. I very quickly went from training with professionals and having realistic ambitions of taking a fair crack at breaking into the fringes of the county game and possibly the Irish national setup to having to give up bowling quick pretty much forever because of unpleasant knee complaints. Even when you make it, you'll only ever be one injury away from being jobless.
I'm going to assume that you're a proper adult with a job or vocation. Stick to that.