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If you chase two rabbits at once, both will escape -- ancient chinese proverb

Ask everyone who is fighting every day in the companies they started 3/4/5 years ago - they all wish they were doing deep learning or blockchain!

Some days, it is normal to wake up and think that this other idea you have is far more promising and has far more potential than the one you are working on. Just stay focussed and finish what you embarked on. Startups are about execution. Ideas are only 1%. Soon the novelty of the idea wears off and it is what you do day to day that distinguishes your company from others.