To better handle the collagen `problem' first consider your sugar consumption. https://www.ediblehealth.com/blogs/our-blog/sugar-and-collag...
That link contains good info but... i feel like its a bit too biased when they also happen to sell what they're preaching.
I'd say the best solution is to reduce sugar consumption and just eat foods with a lot of collagen, such as fish, bone broth, beef, eggs - these foods also happen to be generally high in nutrition per gram, so you can eat less overall, and still get the nutrients you need. (without sponsoring some supplement manufacturer)
like with eggs, natures vitamin supplement... that white "skin" between the egg white and the shell, is pure collagen.
Anecdotally, I designed and built a simple 'LED on a stick' to emit 660nm or 850nm red light at levels that cause eye damage and found it cuts wound healing time roughly in half.
Can you share exposure time and cycles info?
Driven at 1 amp, ~2 inches from skin, ~5 minutes, twice daily. 660nm seemed to work better. Note that 850nm light is not visible and exceptionally dangerous. You will burn your eyes by looking at anything the invisible light is bouncing off of.
Thank you!