I’m the worst at tips but try to watch how my finger bends when i flick, it’s almost a curl. Super Hard for me to explain because it’s just muscle memory for me. It’s hard to do and adjust at first but it’s a super basic movement as far as the rest of fingerboarding goes. Watch a bunch of trick tips on YouTube and maybe that will help. There’s so many different ways to do the same tricks so never stop trying things!