I don’t intend any jokes or double entendres. I am happy to help, but providing troubleshooting support over non-real-time medium like forums is very time-consuming, as there are large delays between messages. Communicating over Matrix (via Librem Chat, Element, whatever) is much faster for me.
Edit: I scraped together a tutorial for you.
I was recently assisting another user this way. Check room #community-librem-5:talk.puri.sm starting at this message dated 2023-11-10 13:36:20 PST for an example of clearing out old kernels and freeing up space in /boot. It’s on my TODO list to document this process and automate as much as safely possible.