A bit late, but here are my comments, hope they are helpful?
First, the type of cyclist you are targeting makes a difference. Leisure rider, commuter or competitive sport enthusiast? The different groups often have very different requirements and expectations, but also some common needs. A bike fit for purpose and comfortable to use is probably genereric to all user groups, so anything that helps achieve this is advantageous so maybe look at bike fit or methods of bike adjustment?
A leisure rider wants to get maximum pleasure from riding the bike so look at things that might be inconvenient or frustrating about bike use (punctures, transporting bikes to a ride location, getting lost during a ride, maintaining a bike before/after a ride, etc).
Commuters face their own particular set of challenges. Lighting is a big one, especially if riding all year round in all weathers as the shorter daylight hours and gloomy weather in winter months can mean keeping lights charged is a battle. Knowing if your lights are charged sufficiently would be good, a range of lights that could communicate with a phone app when interrogated and give a figure for hours charge remaining would be brilliant. Another problem for commuting is drying wet clothes. Arriving at work dripping wet even when properly dressed can leave you needing to dry jacket/over-trousers/shoes in 7-8hrs ready to ride home again. Anything that can help this would be great, either something for personal use or a dryer unit specifically for cycling gear that might be installed by an employer?
Bicycles are generally simple and reliable, requiring a small selection of basic tools to carry out most routine repairs/adjustments with many people just taking a bike to a bike shop for an annual service on top of routine care. This means that focusing on the repair aspect of cycling leaves you with limited options.
Hope something in all the above is useful and inspires you to design something great, useful and unique.