When your main forte is possession and technique then abandoning it completely is in my opinion a bad choice.
Why abandon something you're good at and solely focus on style you only practiced for a week, when you practiced possession for years.
The obvious choice is mix them together and you still can play aggressive with High Midfield and Fullback line.
Being flexible when needed gives most often best results in football, rather than being stuck up and just committing to a single concept.
When there is lot of open space for forwards give them ball to run into open space immediately, if not tire out opponent with possession, side change, tempo change, make them run.
That automatically opens more space for Direct football too as humans are not machines, we tired out and make mistake, when opponent makes mistake space opens up and you can make a play that has better chance of being successful rather than being stuck up on 1 concept.