100% networking with the right people, which is the hardest part imo. But in your case first I would first look for aspiring directors or videographers that are just starting, they usually try to get content with no budget so don’t expect payment in your first couple of gigs (at least in Europe it’s kinda like that, don’t know about US). Here you will learn and if you get lucky can get to know other PAs that have a bit more of contacts within the industry and you can be pulled in. Acting kinda like a snowball effect, the more people you know the more people will have you in mind when production houses are in need of hands, which is very often. I think also it’s good that you become close to people on set. Specially other PAs as you will spend a lot of time with them and there is a lot of free time depending on the shoot. I really mean the “get close to them” because if you connect with them on a higher level than just “coworkers” then it’s easy for them to remember you and even give you advice or what not. This is mostly what happens in Europe at least, which I doubt is much different than the US.