What are some ways to build a quality email list reasonably quick (like, within 90 days) to at least 1K-2K subscribers?
"Quality email list" means...every person on that list has some level of interest in the specific niche, already knows who I am, and wants to hear from me when they get their first email from me.
Note: I'm NOT looking for easy. I'm exploring different strategies that actually work.*
I know of (and have used) 3 main methods/strategies:
1.) Classic "organic/seo" with backlinks, quality content (many variations)...all driving traffic to a niche opt-in page.
Lots of work, but with decent copy and the effort it can certainly be done.*
2.) Various "paid" traffic: Adwords, FB ads, banner ads/networks, paid solo ads, direct mail...sending traffic to a niche opt-in page.
If you've got the money, you can buy just about as many leads as you can afford.
3.) Teleseminar event with experts: You host an event with a dozen or so experts in a particular niche who each have a list, each expert emails his or her list about this event where you interview them...and for people to attend the event they have to sign up on your site (since you're the host)...thus, building your niche list.
Lots of work, but can build a huge list within 2-3 mos.*
*When done right
I've seen various software tools that "claim" to build a list, but I have no experience with these...and I'm always highly skeptical of any "automated/done for you" systems.
What OTHER main methods/strategies are there to build a good quality list?