The motivation needs to come from within. Either you want to be lighter or you don't. And if you have to pay someone to help you lose weight you may as well donate the money to a good cause because that's not a sustainable approach.
Number one thing leading to sustained weight loss is eating less calories, and hopefully, better quality calories. If you exercise, and biking is a great method, you will greatly accelerate the weight loss, but without controlled eating it's a losing battle. I know this from experience as someone that has a history of losing and gaining back over the years. You need to push back from the table and change your habits. That's the hardest part, not losing the weight on the front end.