How can I get more views on YouTube with $50?
You can always go ahead and share you content on your social media platforms. It's a good way to drive traffic to a YouTube channel. I do it and I have some decent traffic coming from all the majore Social media platforms.
About the answer to your question, there are 2 ways we can go about it. However, since we are on a Budget constraint. Have a look at the below image.
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We can spend all our money at once and might end up having the greatest results or we might end up getting the worst ones. So how can we go about it?

Image source - www.instagram.com
You might be wondering how is the above example relevant? Well the reason I showed this creative is you asked how can you get more views in $50. As I mentioned above, there are 2 ways you can go about this.
Google Ads - Create a Google Ads account. You can get a sign-up bonus of Rs. 2000 however for getting this amount credited, you will need to add Rs. 500 to your account. Considering your budget is $50 this shouldn't be a problem. Google ads is quick, and gets the job done if you know what your audience is and how to target the correct audience at a low cost. However if you are new to Google ads, get ready to waste a hell lot of amount as it can be confusing if you don't make proper notes and aren't aware of what you are doing. My honest opinion will be to you either get in touch with a Google ads specialist or watch a lot of videos before starting a campaign. However if you are an entrepreneur type, you will understand this... What if you invested the entire $50 and didn't get the expected results? That's where the above image comes into the picture.
Purchase a Keyword Tool For YouTube - Tubebuddy is cheap, helpful and gets the job done. Since we are on a budget constraint here. Or else go with VIdIQ. Its much more better.
The reason I suggested the second option is you can plan your budget. Tubebuddy' annual plan comes at some $7/month plan and of you use the coupon code 'RisingStar50' you get an Additional 50% OFF if your channel has less than 1000 subscribers.
For more tips check out this playlist