Seeking Advice on Outbound Tools for LinkedIn and Email Outreach

Hey everyone, I am trying to get more customers for my app. Any advice on which outbound tool I should use? I prefer LinkedIn and email outreach, as most of my customers are on LinkedIn. Also any SDRs here to chat with to get some idea about how they do it so that I can move faster and efficiently by learning from them? Any opinions on AI tools that claim to do everything autonomously? I came across a lot of Reddit reviews that most of those tools are not useful. They don't bring any results.