You have no elemental yet. i suggest you collecting wind SSR weapons at next raid event. going mono element with wind squad must be the easiest way to become easy and cheap mono element. you also can farm the wind weapon at material exchange.

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I assume your jewel is wasted so is the one from harem scene,I think it is easier for you to reroll and aim to leech at next raid wind event. It must be easier to become mono wind since you will get a lot of wind kamihime if you reroll now. you can also play the beginner at this event to farm soul point and elixir, etc.

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It would be boring time to fix the mistake. You probably want to get SSR kamihime with its inbound SSR weapon too so reroll would be more tempting to you. Next event is raid event where it's a noob friendly event compared to descent. raid is where you can leech the items. Create your own raid and let the other people finish it for you.
Collect as many as the SSR weapons at the event dont LMB them it is more priority to use all of them as your mono weapon. i predict you can get more than 3 of the SSR weapons usually 5. Use it as your basic mono element weapon. You will get boost from elemental weapon too. Going mono element also much simpler because you don't need to think much since your choice of everything mostly would be obvious.