When I vaped flavors (sweets, fruits, bakery), I found I needed to rotate through them frequently, because no matter how good they tasted initially, I tired quickly of them. Finally i figured out that I could vape menthol all day long. Since I DIY, I tried different flavoring amounts and found lower flavoring just as good or better. Ocassionally, I'd use a little bit a fruit flavor along with the menthol.
A couple of months ago, I went to just plain unflavored and after a bit of time to get used to it, I've come to enjoy unflavored. I keep one tank with a very light menthol now, but mostly vape unflavored. It's mostly pure preference, but feels good knowing that I'm not breathing in extra chemicals.
I thought I'd eventually use up my stock of flavorings, but I've lost interest and may end up having to toss them. Or maybe just use them for flavoring my tea.
Unflavored helps for lazy vaping too. Mixing is super simple and coils last nearly forever.