A crowded market can be
great because the demand has already been validated, but nobody else has emerged as the market leader yet. That's where
YOU step in, with your wisdom and insight about this market, to show the existing constituents how your viewpoint of the world makes life better for them.
So if you don't have any ideas, it means you don't have any wisdom or insight about any market. Therefore, you don't have a great startup team. Full stop.
If you have competent designers and engineers, you could maybe open up a consultancy, and provide implementation services for other entrepreneurs with ideas of their own...
The thing is: smart, creative entrepreneurs see ideas everywhere. They wake up in the morning with a hundred new ideas, lacking only the human bandwidth to pursue them all.
I'd venture to say, if you don't have ideas, you're not really living in the world. You're just looking for a leprechaun with a pot of gold you can claim.
Try just being a fully-formed person in the world, with hobbies and interests and passions and relationships and struggles and obligations and complicated logistics, and see what problems you encounter while living that life.
You'll have a hundred ideas by the end of the day.