The good thing: a call to action. Although uncommon in teasers, from a marketing perspective it can be a good move if you plan to release more and more over time.
Another cool thing is you actually use what you have and make stuff. Too many people hide behind not having the latest equipment. Too learn, to play and to experiment you just need a camera and get out there making stuff. So you are having the right attitude when it comes to taking action.
Now I will nitpick about the content and it is not meant to be harsh, but as food for thought.
- I have no clue what this is about AND I don't feel teased or any curiosty at all. (Actually, as a fellow filmmaker I am curious, but that is because I'd like to know how you can make a better teaser

But as a viewer: nope.)
You can tease people by revealing what it is about or you can just make them curious without doing that. You need either or both boxes (content/curious) checked.
- Most shots feel random. (The feeling of randomness often comes from lack of context.) From the 1 quote I can tell there is some kind of drama. Use that shot, add a reaction. The twoshot can work as well (comfort after yelling) and add some other quote.
- It is too slow and too many titles.
I would suggest:
-Skip the 'your teaser is here', because it adds nothing, but time.
- The first shot should be last.
- start with 0:28 from concepttrailer and with that voice-over
- 'You don't know what I'm going through!"
- Empty glass hits bar
- some shot with the beard that adds context
- Bar shot bold man arm on main character
- maybe here the chairs in the sunset, although it feels like not fitting the style
- end screen with your name and actors
- maybe "follow us"
Keep on going and you will get better and better
Trailers and teasers are hard: you want people to care, but you don't want to give it all away.