I'm a bit late to the party here, but found this thread when I was in a similar situation as OP: I wanted to create a separate account to run FB ads. It worked out well in the beginning (no ban for multiple days, joined a few facebook groups, had some good conversations within those groups), but similar to OP, the account was quickly banned before I even got a chance to run ads.
Creating the account and "warming it up" was a bit time-consuming as well, so like the others in this thread have said, I ended up wanting to purchase an ad account instead. However, while many people here recommend OP to purchase an account, I think what many people may be missing is the "what next" part of it.
For me, once I concluded that I wanted to purchase an account, the next question is "well how can I make sure that my investment doesn't just die immediately?". It would really suck to purchase a brand new ad account and then right when I log in, or a few days after logging in, the account is blocked by FB just like the one I had tried to create.
If anyone has some recommendations on steps to follow to avoid getting a purchased account blocked, I would love to hear it...though as I type this out, I am thinking maybe this is better off in a brand new thread...