One method is to run individual wires in a conduit system such as intermediate conduit rigid.
Run wires nonaccesible from outside to attic.
After routing the security cameras wires outside you can add a security camera wire cage to protect outdoor cameras from being tempered or stolen by the thieves.
Prepare for that by moving insulation away from the walls through which you need to pass the wires and marking the existing wires you need to remove.
There are two ways to run electrical wiring on the exterior walls of a house or other structure.
Do not drill them through the joists or rafters.
The attic wiring should be protected and secured to ceiling joists or other wood structural supports.
If you are planning to run security camera wires outside beyond the suggested range take the following tips into account.
The following links will assist you with your electrical question.
Nm through to soffit in non accessible attic junction box under soffit to transition from nm to 10awg thwn grounds crimped thwn in 3 4 metal conduit down to switch or 2 circuit solar load center through the wall into the basement and into the subpanel sized for at least 5760w if using a load center or 3840w if using switch.
If you can run it across by stapling it to the rafters you can avoid the insulation thing.
Step 2 find your attic access.
I just got back from my attic and realized i can t access the soffit from there.
The original plan was to run security camera wires up through soffit into attic down into basement but that no longer is an option.
Add a wifi extender to boost the wifi signal.
Yes this should be corrected and it would be good to have the wiring and all the circuit connections inspected as well.
If the attic is inaccessible you have less a worry about protecting the wires than you would if it were a storage area.
Measure the distance between the two sites you want to run wire between and make sure you will have enough wire.