Do you think it will change the four years circle by reduction or it will still remain on the four years halving circle.
Nobody is going to change that
A reduction in time means the reward is going to be halved earlier, it puts pressure on the miners that have accounted for a 4-year cycle.
Prolonging the reward doesn't work
For example, let's assume this is the halving and you have 3.125 blockreward.
It's 2028, 20343750 BTC have been mined and you think of keeping another 4 years with this reward, this will add 656250 more coins, which means that in just 8 years from now all coins will be mined, in the first 4 years cycle 10.5 mils coins have been mined out of the possible 20999999.97, so if the first cycle would have run for 8 years the whole mining would have been mined already, since the supply is halving in each period, running a period twice as much means more coins will be mined that in all that is left 50>25+12.5+6.25+3.12+1.56+.....because the last satoshi is indevisible.