I agree with those above me here. Keep what you have. You're not really losing anything. The performance of RTX is acceptable at the 2070 level at 1080p, but I have serious doubts about the 2060. Anandtech's review doesn't seem to say one way or another, but I can't imagine it has the same raytracing hardware resources as the 2070.
Also...the more you ship back and forth, the greater the chance of something misfiring and costing you time, money, and hassle. Is it really worth it?
To the OP:
Why did you buy a 1070, if you were ambivalent about it?
You were definitely ambivalent, since this is an industry that always has changes in prices. You knew that when you hit "add to cart".
To ask it another way, if you had installed the 1070, THEN saw the 2060 price, would you now be thinking of uninstalling the 1070 and shipping it back? Probably not. Install what you bought, use it, and save yourself some time. And next time, make SURE the item you really want is what's in your shopping cart. Or wait.