Quite the chain 
Because of corona I'm mostly stuck with LinkedIn, but it is quite hard to connect with the right people and at the same time fly over the spammy people.
What is the best move when it comes to LinkedIn? Find people that are heads of a company and try to sell my services?
My experience with Linkedin?
There are two kinds of people there:
- Cocky monkeys bragging about their endless list of semi-fake titles; basically everyone MUST have the word "manager" somewhere in their CV
- Recruiters who desperately try to spam the same email to 1000 people and get 1 or 2 answers back.
Like: "Hello [INSERT NAME], we find your legendary CV particularly spectacular, you will be the best added value to our company since 1926, would you please sign this sub-contracting recruiting obscure contract to work for a company you will know after the whole process is done?". No, thanks.
Keep an eye on Linkedin, but do not invest too much time there. I almost never saw a serious job offer, particularly for a contractor.
Put yourself in the clothes of the company you want to work with. If you need a specialist contractor, would you first look at Linkedin? I wouldn't, or at least not as first choice.