I need tips on grinding in Versus

Lunar

I'm trying to get more crystal shards, but the only thing I can do is to grind in Versus.
Problem is, I hate grinding. It's so annoying and I hate sitting there four hours on end trying to grind, I usually get sick of it by 750,000 points.
Any advice to keep it going? I usually to the 3-4* arenas.
Also, what's a safe point distance for getting the champions?

I_am_Groot

I don't know what are you doing, so I'll give up generic tips, maybe you already know it.

1) Maxeup your champs. You'll make more points and faster and you'll can do the next tip.
2) Build a infinite streak. You'll save a lot of time doing it. It's maybe the trial grinding.
3) Make your maths and grind just according to your schedules, then know your goals. If you grind wanting unrealistic goals you will end burned up. If the realistic goal don't deserve your grind efforts invested then don't grind.

You can see the past cutoffs here.
https://docs.google.com/spreadsheets/d/1sJtSVnjhhRNxpiuMR5uXrsTlrsXMjp9TNO7JHDXhtsk/htmlview#gid=0