yes in theory when supply is cut and demand is fixed then prices will rise. but in the bitcoin market everything can happen bitcoin can go up and down after being reduced by half. but the majority of bitcoin holders are optimistic that bitcoin will rise after halving like the previous halving day.
and these two years we have been in the bear market. so everyone hopes that next year's halving day will make a bitcoin bull run and also make the altcoin market go green again.