The question “Why now?” is about timing. Why is the timing right?
The market didn’t wait for you. There is plenty of competition. Are you not too late? Or are you not too early?
What is it that has changed recently that makes you believe that the timing is right? Has the regulation changed? Has the technology matured? Has the market changed?
Sure, here you are now with your new business. You have changed: you have seen a business opportunity that you didn’t see before. The timing might be right for you – e.g. you have the know-how, relationship and finance to start the business now – but the market doesn’t care about that. Look at things from the point of view of your customers, not your own point of view.