Just became cavalier!

Cost about 400 units worth of revives. Since I have no reliable bleed immunes, I had to max boost domino 4/55 and keep trying on CB. First 4 quests were easy and cost no units. Last quest was a little bit of a pain because of how tanky sentinel was, but I got him down. Opened 3 cav crystals afterwards and got a 5* blade dupe again, 5* CW, and a 3* BP. Should I spend all the units I earn on cav crystals? They seem like they are worth it for the drop rates
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Second, no, you shouldn't spend all your units on Cav crystals. I personally believe they are one of the better things to spend units on for someone that has probably unlocked all the masteries they want. But I don't think it is ever a good idea to blow all your units on one thing. I actually think the Cav offer after completing 6.1 the first time is a better offer, and the unit offers that come along every so often like the July 4 or Black Friday offers tend to be better, and there's things like the VIsion offer which keeps getting better.
At the moment, I am spending about half the units I earn from game play on Cav crystals, and banking the other half for future offers. Depending on how much units you earn and/or purchase, your mileage may vary. But I do think if you can't buy them in a disciplined fashion, you should probably avoid them entirely. @Shrimkins isn't wrong about them being psychologically tempting. Even I've found myself buying just one more, and then just one more, and then going below my mental budget for them and having to abstain for a month to catch up. And I consider myself an extremely disciplined player.