Then you should keep an eye on Virgin fates, as noted above.
currently some outstanding deals:
https://www.headforpoints.com/2017/1...class-tickets/
unknown if they will extend to 2019, but worth watching to see.
And if you fly to Hawaii on Delta in F, crediting Virgin with tier points, your whole trip will get you silver status with Virgin, and not far off gold - assuming you don’t already hold Virgin status.