I think it is dangerous to look at it from a 'top 5 options to gain steam' point of view. Those are tactics that can help, but it is extremely important that you first define a strategy behind it.

To significantly increase your chances of success (and avoid extreme overwork trying 5 tactics at once, which often causes burnout), I highly suggest you do two things :
1 - select a specific industry
2 - select a specific geographic area

The best parallel I can do is with Starbucks. It looks today as if they are everywhere. But in reality, they started small, tested and tuned their 'system' locally, and gradually expanded geographically.

Facebook did the same (started by only focusing on the academic market, on one specific campus, with a clear focus on the 'dating' aspect, and then expanded).

A clear message is very important in terms of customer acquisition because a high level of specificity creates an 'this is for me' reaction, which instantaneously creates trust in your solution (one size fits all is dead).