How to get more 5 star shards to get a first five star

Guys pls help me I have 8000 5* shards I need 2000 more five star shards where to get it for my first five star pls guys help

Comments

Got another 5*

In treasure island I got featured 5* crystal

And got a terrax

Is he good

See

See

Here I completed the epic 17000 in the treasure island

Terrax is ok at best