What Rob said.

It helped me to write mine as though I were pitching it to a friend - a specific friend who is too busy and impatient for me not to get straight to the point.

But, I do feel your pain! It helped me to write a cover blurb first as though for the back cover. It also helped to do it at a time I was already busy as heck writing short pieces of this and that. Sneak up on yourself and do it. Send it to a friend who's not in the usual loop and ask if it sounds like something they'd be into, and why or not. In the end, it really is just a letter to a friend to interest them in your work. So what if you haven't met that friend yet. Make friends.

Super!

I've spoken with a lot of writers who find the hardest part to be just starting.

Kudos! Keep in mind how fulfilling this was, so that next time you can focus on that instead of the silliness of dread. Oh, did I mention that the hyperbole was rather entertaining as well? I find that when things get to that overblown sense of lockdown frustration the best thing for me to do is enter fully into it and blow into a theatre of the absurd so that I can laugh off the stress and get to the solution part.

Again, pat yourself on the back. Positive self-reinforcement is highly effective motivation.