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Hi there, and welcome to the forum.
Firstly, credit repair services are almost never worth it. I'm sure some here may disagree but I don't see any benefit to them at all. There is nothing they can do for you (legally) that you cannot do yourself. That extra $100 a month could be going towards your outstanding debt.
The first thing I would recommend is putting together a small emergency fund of at least $1000. Second, I'd recommend getting a secured credit card to help re-establish good payment habits. Keep the limit modest to keep you from going overboard with impulse buys.
Take a second look at that credit report to ensure all the baddies are validly yours. Dispute anything that looks weird.
If your goal is to pull the trigger on a house in two years, I would recommend putting together a house fund and placing a percentage of your income in there every paycheck. Investing in a mutual fund/index fund or good exchange-traded fund that pays dividends may also be a good idea.
The bigger down payment you can place on the home, the better your odds. Two years from now you can easily be in the high 600s or better and your required down payment before lenders will consider you will start to slowly come down. But don't be tempted by that. In your situation, anything less than than a 10% down payment is asking for a world of hurt.
Oh, and just out of curiosity, why does your ex-husband's plans matter if you two are divorced?
I hope this helped and good luck to you.
I'd recommend Capital One Secured Card, mostly because I hear it's somewhat straightforward to have it converted over to an unsecured card once your credit is built up enough. Be sure to keep your utilization between 1% and 20% (this can be tough with a low limit secured card but it can be done by sheer force of will). Also, never neglect the power of cash when in doubt.
And yes, sadly the most effective way to rebuild credit is a mixture of good habits, smart utilization, and time. This is just a fact of life and will never change.
Sorry to hear about the denial. Do you have any paid down unsecured cards (in your name alone) that may be lingering from before your credit troubles? If so, just use those to rebuild with.
If not, the Open Sky Secured Card and Discover It Secured Cards are two more options. In the case of Discover It Secured, you have to apply for the regular Discover It, and after being denied, you may get an offer for the Secured version, but it's not guaranteed.