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how to get gold?

I opened a 5 star hero crystal yesterday and got a hulk Ragnarok but to my annoyance i couldn't even take him to rank 2 despite having all of the catalysts because I only have 60k and very little iso any ideas particularly as I would like to rank up my 5 star korg to r3 for alliance war defence as well at some point.
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But for OP Arena is the answer. Grind it like no tomorrow and get all the milestones even in 2* basic.