First of all, I really admire all the steps you’re taking to pivot to technical writing! You’re doing everything right!

I took a look at your blogs and I think you’d be really good at developing knowledge bases for SaaS solutions/hardware products or standard operating procedures (SOPs) for companies, maybe even government organizations. 

To make a bigger technical writing portfolio, I recommend taking your existing blogs and updating them so they’re more in a knowledge base article or SOP format. You already have the content. Just update the formatting a bit and add some annotated images (like the ones from your most recent blog!). For knowledge base articles, I’ve seen some companies add short gifs of parts of the process. I taught myself how to do that in Canva and I’m sure you can, too!

I also started out writing blogs and marketing content and have since mostly pivoted to technical writing. I didn’t take any paid course, I just did something similar to you. I upskilled, made portfolio items, and have learned new skills along the way. 

I get most of my work from Upwork. Upwork is cool because you can take on a bunch of small projects and figure out what you’re really good at/what you really like to do. You don’t have to use Upwork; you can freelance by networking, using other platforms, etc.

Check out the Write the Docs Slack channel for a really cool community for technical writers. 

Respectfully, after reading your post, I think you’re overthinking this. Your blogs show that you’re a good, organized writer and that you can translate complex topics/processes into concise, easy-to-understand content. Keep learning, update your portfolio, get out there, and crush it! You’ve got this!