Anything is possible especially if you are willing to put in the hard work but is it likely? Let's take a look at what it takes to be successful to see if it is possible for you.
YouTube Videos: Quantity or quality
There is no right or wrong answer, only what would work best for you. For the fastest possible growth and to ensure you get 1,000 YouTube subscribers in only one week I would want the numbers on my side. I feel like it would be unreasonable to focus on one amazing video for a whole week and hope that it makes you go viral.
Instead a better option would be to upload three new videos every day based on well researched topics. You could do three long form videos and 1 YouTube shorts video every single day for one week. This would total 21 videos in your first week and to be honest, it is still unlikely to get 1,000 subscribers. Either way though, it is probably your best choice if you want rapid growth. In order to reach your target you would need each video to get you at least 47 subscribers each.
How to increase the odds of success?
It would be much more likely if your videos were engaging, if you combined the 21+ videos with perfectly optimised titles, descriptions, tags, thumbnails, if you had a social media strategy; uploading an instagram reel, photos, TikTok videos, Facebook reels, and writing relevant blog posts, embedding the YouTube videos, contacting leaders in the same niche asking them to share your videos with their audience, use paid advertising if you have a budget or use a bootleg strategy if you have another YouTube channel that already has lots of subscribers.
The problem with fast growth on YouTube?
The problem with trying to get fast growth on YouTube is that it is unlikely to get fast growth on YouTube. YT Shorts typically get a larger reach but is shorter lived than long form videos, so that could be a way to get lots of subscribers but in reality making videos for YouTube is a long term strategy comprised of hard work and dedication.
It is a marathon and not a sprint, if are serious about doing well on the platform, sprinting at the beginning of the race might slow you down long term as it is unsustainable. If you get some success and face burn out, you are going to start seeing slower results from working slower and this will be un-motivating potentially causing you to give up. In one week, the algorithm wouldn't have worked out who your audience is and so most of your views and growth are going to come from posting consistently for at least 3 months.
The best option for long term success
Why do you want to be successful so quickly? A better option would be to figure out your passion, write a content strategy, enjoy the content creation journey because if you don't enjoy it, you won't stick at it. If you truly want to be successful on YouTube, you will like this article that goes in to depth on the topic of can you be successful on YouTube as it provides 8 stages that are needed to turn your passion into a career.