Links below are results that turned up from me (Brent) doing this Google search https://www.google.com/search?q=types+of+christian+testimonies
A long list of testimonies https://www.christianitytoday.com/ct/topics/t/testimonies/ are these good examples?
Short read of "Christian Testimonies: What the Bible Says" and "Christian Testimonies: Why They Matter" the end of the article links to an article on Witnessing https://www.allaboutgod.com/christian-witnessing.htm which is also a pretty short read
Short read Preparing Your Personal Testimony https://www.cru.org/us/en/train-and-grow/share-the-gospel/evangelism-principles/preparing-your-personal-testimony.html which leads to Your Story is God’s Story: Creating Your Testimony https://www.cru.org/us/en/train-and-grow/share-the-gospel/evangelism-principles/how-to-tell-your-story-worksheet.html
A short Testimony sample https://nextworldwide.org/resources/sample-testimony/ good/bad?
What We Get Wrong About ‘Giving Our Testimony’ https://relevantmagazine.com/god/what-we-get-wrong-about-giving-our-testimony/ good/bad
How To Write your Christian Testimony https://www.learnreligions.com/how-to-write-your-christian-testimony-701445
Here is my testimony and to help you write yours... below it is the template I used in the process of writing it. Brent's Testimony
Send us your written testimony to add to your testimony page even if you already have a testimony video. The testimony text can be shorter or longer than the video. Also pick an image (landscape orientation only) to be used for your testimony page. Free places to get a picture are https://unsplash.com/s/photos/jesus?orientation=landscape or https://pixabay.com/images/search/jesus/?orientation=horizontal or https://www.pexels.com/search/jesus/?orientation=landscape or ask us to pick one for you.
Please also let us know if you are willing to allow us to use your full name in the title of your testimony. I (Brent) personally feel this it the correct way to do it, but you let us know if you are comfortable with that or not.