Engaging Short Vertical Videos for Socials

I need very simple short vertical videos for Instagram and LinkedIn.

Video format:

7 to 15 seconds
1080 x 1920 vertical
Text-based
AI voiceover
Light background music
Clean transitions only
1 or 2 simple icons/images if needed
No complex animation
No advanced motion graphics

Content format:
Most videos will be simple step-based videos such as:

5 steps to feel more confident in interviews
4 ways to sound more confident on a call
3 mistakes to avoid in job interviews

I will provide:

topic
hook
step text
preferred style reference
brand colors/fonts if needed

You will provide:

final MP4
consistent template-based design
AI voice synced properly
light music mixed at low volume
fast delivery in batches

Important:
This is a bulk, repetitive, template-based job.
I am not looking for custom creative editing for every video.

Please share:

2 or 3 short vertical sample videos
your price for 20 videos
your price for 50 videos
your turnaround time
whether you use AI voice and which tool/workflow you use