How to get away from the “felt no spark”

I go on a fair few dates and even get some success from them. However the overwhelming majority end the same way, you were nice but feel a friend vibe or no spark etc.

The dates are rarely awkward and I manage to make it fun but I just struggle to get their heart beating. It’s always that “nice guy” vibe.

I’m mostly an introverted guy and have just come from another one of these dates. I’m just sat here thinking, is being myself not the answer. Should I just play a character to have more success because this ain’t working.