Each innings should comprise twenty EIGHT BALL overs; as was the norm in Australia sixty years ago. Three bowlers can bowl a maximum of five overs, and the remainder a maximum of four overs.
Under this system games would comprise of 160 balls per team rather than the present 120 balls, and three bowlers would be able to bowl forty balls rather than the present twenty four. Because most time is wasted in the change of over, the games would not be extended significantly.
I believe this plan would help involve bowlers more, and also add to spectator excitement.