Why do people think the Bitcoin chart repeats itself every cycle?

I get it there have been some patterns. There's the 4 year cycle and the halving - but does this just magically happen by itself?

The price goes up when more people are buying than they are selling - why would people's behaviours be aligned so tightly to the TA - don't world events and sentiment play a big part?

I still really believe in the future but I'm holding for 10+ years so it doesn't matter much to me

But can anyone enlighten me as to why people are so sure things will go the same way as they have before when things are so different now?