Given Covid, any schedule beyond the current month should be treated as a placeholder, and may be subject to change. Unfortunately, the particular route you had planned to fly (the nonstop flight between EWR and HNL) has not yet resumed, but there are certainly flight connections which would allow you to get there.
Below are your options:
1) If you intend to travel to HNL and on UA, you can switch to the flight UA has suggested for you, or another connection more suited for your travel needs.
2) If you intend to travel nonstop to HNL, you would have to seek a refund from UA, and fly on Hawaiian Airlines; at least through near-term schedules (e.g. February), HA is the only carrier flying without the need for connections.
3) You can place a hold on travel, and as alluded to above, seek a refund from UA to make you whole from what you had paid (no additional compensation). You can also cancel and place it as a flight credit for future uses.