Joustick Jumping/ Fall Acceleration

Hello all
I`m working on mobile 2D side scroller game and I have a problem with fall acceleration
So problem is in delay. I need the character to hang in the air for a second and then fall down with acceleration. Acceleration increases after each delay, but I need to make delay once then increase acceleration on each frame.
Please help!
Im also not sure that this needs to be done in event tick
Any advice is welcome!
BP: