"so what do you guys do to your electronics (TV, Consoles, Computers, etc.) to make them last longer?"
For things that are actually working, very little.
Treat them well on the outside, avoid mechanical impacts and liquid spillages...
For some things occassionally (once in several years) perhaps remove some screws and open the casings so one can clear out accumulated dust from fans (only for things built pleasantly enough that opening the casing doesn't immediately risk tugging wires and flexing boards).
Most of the advanced techniques one can use are for trying to repair things which have already got faults, not for pre-emptive maintenance on working items.