How to maintain CB's Furies without Mangog synergy?

Mephisto

Any tips would be really help since planning to take my 6* Unduped CB to R3

Shadowstrike

Short version : Be aggressive.. B. E. Aggressive.

Long version: Crossbones does not have crit abilities, so whenever he would crit, he gains a fury buff instead, so you're going to have to be very aggressive with your play style if you're going to make him your top skill.

TheBair123

Here are some videos with Crossbones. Now, I did use Mangog synergy in both of these, so keep that in mind
https://youtu.be/vARxyrSPXD4
https://youtu.be/5p0UzUTDdmY
My tip to you is to get used to heavy countering the opponent’s specials, similar to how tigra does. That way, you pause your your furies without losing one.

GrassKnuckles

A lot of heavies. Really the only way. Time management is key