Don't jump on your bed otherwise you'll end up having to go to the hardware store. First step: strapping the bed so it doesn't collapse.

My drill is broken, so I'll use its chuck and manual drillbits, that will work fine on soft wood.

Here's the good old trick of taping the drillbit to avoid drilling too far.

Terrible quality screwdriver to start the job.

The screw head comes too deep in a narrow recessed hole.
That's a way to get deeper while having enough leverage to get it snug.

Once this part is fixed, the other part of the bed needs to be strapped to avoid collapsing.

Same on the other side.

Let's get rid of the mattress and its frame to make sure it's all straight.

One major issue, holes and pins have become oval, so the sides of the bed sit at an angle increasing the risk of collapse.

Ugly reinforcement to counter the torque from the frame.

Schematics showing the wood screws in orange and the steel reinforcement in green.

Slats were all bent and had different spring rates, possibly due to humidity or wearout, so I changed all of them.

The bed was still shaky, so I reused a plywood beam to make the structure more rigid.

I tested the frame by throwing a crate of beers (~20kg) on top of it, it really makes a difference with a stiffer frame that doesn't squeek.
Now I can get fat!