Well, If you are looking to do it professionally for a living, game dev is indeed not an easy path. But you can always do it as a hobby, many successful indie project started as a hobby and once the developers see that it is going somewhere, people do like it, only then they considered to invest more time and money and may even hire people.
Personally I don't believe in collaboration for commercial projects, it is just impossible to find random people who just as passionate and dedicated and share the same exact vision as you are. Sooner or later there will be differences in creative and design decisions and that point someone need to be in charge and once you signal "it is you and it is your project" that is the point when you begin to lose people. In my opinion you either do it alone or hire people to do it for you or make it open-source.
If you do it alone, you need to lover the bar, more simple art style with less detail, simple gameplay, less features. As for sound effects and music, there are lots of free music and sound effects out there. For example
https://soundimage.org. Even blockbuster movies often use the same song, you can certainly find something that fit your game.
Even if you do it alone it helps to get your game in to a state that you can show to people and get feedback. If you get positive feedback from people it gives you that extra push and motivation to keep you going and if you can learn from negative feedbacks this is how you can make something great.
