My experience is the exact opposite. Not saying your wrong or anything, but I personally love keto diets (with periodic refeed/skiploads of course). My energy is great on them and I hold on to strength very well at least in terms of getting down to 8-10% bodyfat.
My wife, however, shares similar experiences with u and generally just feels awful. So I guess it certainly isn't for everyone, and it seems like carb-cycling is the more popular approach currently (who knows, maybe keto will come back in a few year).
In most of these types of posts, the OP usually has his mind made up anyway. So I say either go for it or slowly start lowering your carbs down via cycling. Both work and everyone has their preferences.