The following resources may be of help to you:
How Do I Know I am Getting Better
Knight and Gitterman 2018 Ambiguous Loss
HEALING Milestones What Grievers Can Expect with Covid-19
These books may also be of interest:
The Other Side of Sadness: What the New Science of Bereavement Tells Us about Life after Loss by George Bonanno
Option B: Facing Adversity, Building Resilience, and Finding Joy by Sheryl Sandberg
See also our Resiliency and Coping page