If you want to keep it in one piece, first item should have been the biggest cooler you can afford. Summer is almost here, turbo engines really drop power in the heat and the standard cooler is a joke. It's the best insurance you can buy against pinging or overboost, which is what will happen with bleed valves etc until you can afford a decent aftermarket ecu.
Not much good having a cool sounding BOV with no ring lands left.
There is a well worn path to making power in the R33 in Zoom magazine.
It's pretty spot on as my son's 33 has 170rwkw with cooler, exhaust, blended dump and filter. Now it's run out of fuel so that's fuel pump, regulator, injectors, Apexi pfc and boost control. Then it will be turbo time.
Pretty logical steps.
Stay cool.