Accessing wp admin of a multisite with expired domain

Hi,

I got a multisite network, and got subsites on it, unfortunately the main domain has expired, and i cannot access my wp admin, i dont worry about the main site but i need to have the subsite.I am able to access the main site using the ip but not its wp admin. I tried following this but it didnt helped. I saw a way via accessing db (this method) but i couldnt access db as its hosted in digital ocean, its pretty hard without a control panel. Any help would be appreciated and it is really urgent. I am out of solutions worth trying. .
1) want a way to access main sites wp admin
2) access my subsite via url(it has a separate domain which is being masked)

Thanks