How to use my Generic 3-4 (2015-2017) from V5

I want to take my Morningstar up to rank 4. I explored V5 chapter 2 and got 3-4 generic 2015-2017 gem. So i want to use it on Morningstar. But i couldn’t use it as i have 2 rank 3-4 Mystic gem. What do i do now? As i don't want to use my Mystic 3-4 on MS, i want to save it for Longshot and Doom. and also MS is from 2017, that's why i want to use it on MS.
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By far the best way that I could come up with is to keep your Morning Star in 5R3 till you use the mystic RankUp Gems on Longshot and Doom.