The best cold approach game system/ course/ site for getting laid.

What is the best system/ course/ site channel for getting laid from cold approach? The one which is very effective and applicable in real life practically. I have access to literally most of the most famous courses like RSD etc + many people also suggested youtube channels of some PUAs. But I don't have a clue which one I should invest my time on . I don't have time so I can't spend 30+ hours on a single course UNLESS it is the best effective. I feel extremely Clueless kindly help.