Mine is mapping. I am a big OpenStreetMap contributor and I have mapped many towns near me that were previously completely unmapped.
Don’t be afraid of just amassing a bunch of ‘cheapies’ to start with, there are so many fantastic fragrances made by renowned perfumers/houses, that you can buy for under £50 (€/$/etc) to train your nose on and figure out what you like.
That’s actually how I have Vanilla Vibes and Quorum, I literally just blind bought a load of cheaper perfumes going by what looked interesting on Fragrantica or was recommended on youtube, and I would likely never have bought or learnt to pick out and enjoy their notes had I gotten tiny testers first.
Also many cheap Arabic perfumes (originals and dupes) are surprisingly good, don’t be too afraid of exploring that side of this world either! Al Rehab is a great place to start if you’re unsure/skint, Choco Musk is quite possibly the best milk chocolate perfume in the world and you can get a 50ml bottle for like £6. The rest of their scents are similarly priced and pretty damn good too from what I’ve tried do far.
