I see that we are not going to easily achieve this consensus and what should we do? What can you suggest?
Those who want BU fork unconditionally and create a BU Coin. The rest continues with Bitcoin.
learn consensus, learn diversity, learn decentralisation, learn zero-trust
75% of the miners (~ 3-7 persons!) is not consensus. When there is no chance to reach consensus it's better both parties go their own way. Splitting a new BU Coin is the best solution in this case.