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But I really want to do this biz seriouslly and long term, I wd appreciate your advice:
Most of my sites are not on the index where I search for site:mysite.com , shd I get new domains and start a new site , or shd I redo the old domain , and ask G to reconsider?
If you can figure out what Google didn't like about your automated site, fix it and just start rolling out new sites. It is a simple business decision - Can you launch a new site and make a profit before it gets banned in Google? If you can then go black hat. If you can't then it is time to start working on a nice clean white hat site.
Then you generate lots and lots of pages.
If this was the case I would try to find something else to do * instead of building web pages. This should actually prohibited by some international law :-)
* = Maybe building or making some totally useless gadget that nobody wants. Anyway itīs the same as building totally useless pages nobody wants to read - not even the search engines!
That knowledge and experience will help you go onto more advanced business ventures later on.
If these pages rank high in the serps then it helps search engines identify the weaknesses with their algorithms.