Hey, love Senja :) What I use in my marketing are usually just screenshots form social media as a social proof. It works well. Sometimes the testimonials are coming from very different places and I put them into Senja.
I wish I could make a testimonial less fancy-looking, but more real-looking.
I attached examples of posts from LinkedIn.
The same goes for Skool. Like the biggest problem that in my niche fancy looking images of testimonials look fake. And I do rather real screenshots, they work 10x better :)
Ideally I’d have LinkedIn and Skool templates

