They will help you in exchange for tokens, so you can feel free to write them. You can also look through existing (and already successful) cryptocurrency projects, choose their advisors and try to contact them. But keep in mind that there are a lot of such online consultants, and not everyone is as skilled and experienced as he will write in his profile. So take the trouble to check with whom you decide to cooperate.Another way will take more time and efforts. It assumes to look for a real expert in the field who will be interested in your project, get to the core of it, and will not be torn between dozens of similar programs. This type of advisors is harder to find and interest but they are worth it. Try to attend conferences and related events, form a network of contacts in this field, speak and advertise your project. Let potential advisors see you and believe in your project. So, communication, a little self-promotion and a good product is the key to success.