As a very simple summary, you need to do the following:
Be active on social media.
Search out and communicate with people in the sector that you are interested in.
Don't look at everything as a transaction; look to develop relationships.
Don't focus on one person, be flexible and look for groups of people and don't obsess about individuals.
Favour people you have a natural rapport with over someone more important who turns you off personally.
Don't forget to be a nice person. Relationships should be a win-win for everyone if done correctly.
Both consume and produce content; schedule your consumption and set up your notifications so social media doesn't take over your whole life.
Don't waste time producing large-scale content like a blog or a podcast unless you have other valid reasons to do so (like you have a particular interest or to build a business).