Was it just me, or did I detect a slight hint of upset in your question? The slave trade was stopped because it came to light after decades of the slave trade that black people deserve the same rights as white people because they have equal capability to learn and develop as human beings, as opposed to the previous opinion (and one used by Hitler also) that Black people are comparable to simians, making them inferior. There may have been other issues, but it took a long time for the correct conditions for change to come about.
One important case study is that of Olaudah Equiano, a Black man sold into slavery, who later became educated by his master, was freed and became a prominent man in society, and proof to the White oppressors that Black men were capable of achievement also. This served as a conscious raiser to Parliament, resulting in the cessation of Britain's involvement in the slave trade.
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because of the money Britain was getting from the slave trade
Britain dominated the Atlantic slave trade.
They
they got all the money from selling the slaves
Portugal,Britain,France,Spain