One thing nobody really mentioned... your connections matter more than your posts when you're starting out. If you're commenting all day but connected to random people, none of it reaches your actual targets. Spend a week just sending connection requests to the exact people you wanna work with, with a short note, no pitch. Then when you post or comment it actually lands in front of them.
@Marco69 has a point about it being slow though. IN is not for fast scale, its a long game. If you need clients this month you're better off doing direct outreach instead of waiting for inbound.