Personally, I try to use BTC on every services I need in case it supports paying with cryptocurrencies. A nice example involves Internet related services, like purchasing domain names and hosting services.

Unfortunately, big purchases are still really hard to pay for in crypto, even today. I really hope that the adoption among merchants will continue to grow and reach some point at which you can spend crypto on almost everything.

I believe it could eventually happen, as merchants themselves are interested in receiving more for sold goods and avoid high fees, like PayPal's.