I agree that this type of man is getting slaughtered in today's mating market. The best chance that guy has is through social circle, typically a social circle developed from being in the same geographic area during his K-12 schooling years and remaining in that same area as an adult.
Approaching strangers and swipe apps are going to be a tough path for that guy in the 5-6.9 range.
Best chance for Mr. 5 or 6 average nice guy is probably SoSuave. At least for a permanent solution.
SoSuave, the red pill, and the black pill aren't going to be as reliable in at least the medium term as a good social circle derived from geographical constancy. In a lot of cases, a lot of men don't accomplish as much with approaching strangers or swiping as they would have from social circle. From a social circle, they are better positioned to get that one girlfriend who will last for 5-10 years and they'll have sexual frequency for 3-6 of those years. There are men that couldn't get that from cold approaching or app swiping no matter how many YouTube channels they watch, no matter how many SoSuave threads they read, and no matter how many Rollo Tomassi books they read.
The channel for Mr. Average Nice Guy with a Social Circle is that he'll get divorced from this social circle derived girlfriend/wife in 10-15 years with 2 children. Mr. SoSuave forum reader and Mr. Red Pill is less likely to have a divorce problem, toxic ex-wife, and problematic child support/co-parenting arrangment. Iron Rule #1 - Frame is Everything.