Congratulations buddy, I know the feeling that comes with spending your Bitcoin without having to convert it to fiat first. I have done so on multiple occasions and it's more satisfying then spending fiats. Some might say it's an unwise decision spending Bitcoin but they forget Bitcoin is a currency and it's might to be spent not just held. You can have multiple accounts in which the Bitcoin in your sending wallet should be for spending while that in your investment account should be for holding.

If I may asked though, why the iphone, I get it's expensive and give a certain level of satisfaction but from my finding it isn't anything different from the iphone 12. Iphone aren't as innovative as we think, there aren't that much different. If you want a super phone go for the Samsung Galaxy S21 Ultra. Many people underate Samsung products but they deliver the best phone.