Forcing competition in safe seats

Having no real competition for a business leads to apathy from the business, less motivation to improve, meaning people who need the product of service they are offering are getting a worse result than if there was real competition.

This can be seen in wider elections when parties in power become less innovative and can become aloof to public feeling after wining multiple elections, even if you dislike the opposition, having other parties win leads to competition.
This is also true for safe seats for location constituencies, MPs of safe seats are less motivated to turn up to the house of commons, care about public opinions, etc. 

Voting commission
What can be done to tackle this problem on a constituency level? 
A possible solution could be tackled by the voting commission who decide on constituency boundaries, the voting commission could change boundaries in safe seats to try and add more competition if a parties wins multiple elections in a constituency.