If it is your first video, I congratulate you on starting your YouTube Journey. I hope you had researched the topic for your video i.e. looking at the competition, traffic volume and keywords. Now that you have published the video, I would suggest that you share this video on your social media. If you use reddit, post the video in relevant subreddits if you believe it can add some value. Otherwise, Don't spam it.
The concept of whether to share the video or not is highly debated. I think that when the channel is very small or new, We should share the videos as YouTube doesn't really know what our targeted audience is. So, Sending some quality audience by sharing the video isn't bad. But after your channel gets audience, you should stop sharing the videos and let YouTube algorithm do its thing.
-Mazhar