I must say the race was fairly boring due to everyone protecting tires and pushing for a 1 stop race. People were not able to push and i rarely am getting board with this protect your tires stuff!
Option 1: Make the tires super durable that you can push and push but bring back refuelling.
Option 2: Make tires that degrade by a certain amount no matter how hard you push on them, none of this im driving slow to save tires (this may be very hard to do)
Option 3: enforce a mandatory number of pit stops whether this be 2 or 3 (race dependant), this way cars will simply pit when they have finished getting the maximum from the tires and will push more throughout the race as they no there is no point protecting the tires as they have to get rid of them anyway.