make sure the things you want to solder are mechanically held together

I got great long term tips from others, but yea, that is my main mistake now.

I do not have 3 hands! but I pretend I do!

I do have a flux pen. What temp would I set the iron at? 350-Celcius seemed to work fine.

I guess you call it grease or paste, this is what I meant with fat https://www.ubuy.co.in/product/4M37F90F2-welding-grease-soldering-tips-fat-solder-paste-flux-50g