@thecabbagedetective thank you 😀
@yukinoh1989 thank you. Yes, you are right, I’m loosing some details, but there is a trick – you can add shrinkwrap over multires modifier later and “bake” dyntopo details to multires. And it won’t affect the base mesh, shrinkwrap will be stored in multires data. Or you can just recreate those details manually.
Here is final retopo by the way. Warming up for multires detail sculpting.

And this is the example of how you can return your details
