Hi,
I have a few campaigns that are profitable and some breakeven still optimizing and facing the following issues
1. Banners are getting around 300k traffic daily for one geo, even if it doubles it's not going near x, xxx per day, does it mean I need to have 100+ campaigns?
2. Pops are doing good roi for me but the traffic dwindled and also the roi drops pretty quickly, and I'm actively testing landers. Any better suggestions?

Once you know what you are doing, rest assured that there is more traffic to have than you can afford
Yes, you will need multiple campaigns to reach higher numbers, unless you do a large GEO and go to xhamster and buy all their traffic
You should never rely on a solo campaign anyways, what if it goes down, what if someone outbids you, what if the offer gets pulled, what if the aff network goes belly up ... plenty of reason why you should DIVERSIFY, run as many campaigns as you can effectively monitor and optimize, there is no reason not to.i got a few campaigns on big geos but i ended up cutting placements that had alot of traffic. once in while the traffic placement dissapears.. lols