I have never had a vape subscription, just because I prefer 24mg nic and the subscription services only seem to go up to 18mg.
I have been vaping for quite a while (did the cig a like thing off and on for a few years before switching to large battery and tank system a year and a half ago) and I will say that I have not ventured into the "make your own" or DIY as it is most commonly called. But there are lots of members on here that only DIY their own liquids because it is very cost effective and you can customize you liquid to perfectly fit your palette.
As for me, the first year of vaping was basically me going crazy trying new liquids all the time. I bought most of them online. I started to develop a taste for certain flavors, and from there on I kinda stick to a few liquids that I really love. It's kind of a journey.
If you are going to cancel your vape subscription I would recommend going to a few different sites and order some sample packs to see what you really like. You can get sample packs for pretty cheap at most sites. There is another current thread going right now about where to get the best sample packs. I would personally recommend Seduce Juice, Alice in Vapeland, and MBV sells most of their 15ml bottles for $4.99 each (regular price) so you can try several without breaking the bank.
Good luck!