Movement

I have average to above average velocity on my fastball, but little movement. I have been told this many times, but don’t know how to get more movement. When I use a 2 seam grip it moves a little, but is a lot slower than my 4 seam. I know it’s supposed to be slower, but it’s not the speed I’d like. I’ve been told I throw hard but its ‘‘as straight as an arrow.’’ Is there anything I can do to get more movement on my fastball?

Ive been told the same thing, try appling pressure with your index finger when throwing a 2-seamer this will give it more movement into a righty.