I'm sorry for all the grief you're getting on this thread.
I'm an adoptive parent, and have some similarities in my story, in that life took a sad turn of events which meant the future I hoped for didn't happen when I was widowed in my 20s (lesbian here too).
But then a decade later in my 30s I still wanted to parent and so adopted my children.
Are you able to access some support groups or other support from infertility charity's? I know it's not always easy when your situation is different to the norm so I appreciate it may be tricky. I found bereavement groups very painful when they just weren't set up for a lesbian widowed in their 20s, but eventually I found a few others who had experienced their own grief and were great friends and support.
There is no rush, adoption is a long process and you must have finished all fertility treatment usually 6-12 months prior to starting, so it's not like you can do anything now anyway.
I adore parenting my children, its been more than I could ever have hoped for. But adoptive parenting is often a hard journey; parenting children who have experienced very significant trauma, plus all the other considerations of birth family contact, pre-natal exposure to drugs, alcohol or toxic stress, identity issues, very very high rates of SEND etc. is very different to birthing a child with donor sperm. I know you spoke before about having some adopted people in your life, but some of the other things you've shared indicates you still have a lot to learn in this area before making a decision. (You talked about raising a "stranger's baby" or something to that effect which honestly is pretty hurtful).
I'd focus on giving yourself some time to grieve and support each other, and possibly some counselling (I say this as I wish I'd prioritised it more!) and researching your options xx