When to fix a particular problem you need to use many different approaches all at the same time. What synonym could i use to express this.
The closest I can think of is pulling out all the stops.
An allusion to organ stops, which are pulled out to turn on each set of sounds in a pipe organ. When all stops are pulled out, the organ will play all variations of its sounds at once, therefore being as loud as possible.
(idiomatic) To reserve or hold back nothing.
They pulled out all the stops for the gala wedding.
In the context of your question, pulling out all stops can be interpreted as "using every skill you've got".
Full spectrum approach
Using many approaches at once can be described as using the full spectrum. For example:
Full spectrum diplomacy is an integrated strategy that encompasses all instruments of engagement including traditional diplomacy and public diplomacy.