For 2019, you can deduct the mortgage interest and property taxes that you paid, because you are on the mortgage and the deed, as @Carl says.
For 2020, you may have a taxable gain to report when you sell the home. This is going to be complicated and will probably require legal assistance. I assume that you broke or dissolved the trust so that the house could be put in your and your mother's name again instead of in the name of the trust. The form of that deed will be very important to you. It could be that you were gifted half the house, and inherited the other half when your mother passed in 2020, or it could be that you inherited the entire house in 2020. The tax results are going to be very different for you.
Basically, if your mother had a life estate, that means that even though you were joint owners, you could not sell your half as long as your mother was alive. That means you really didn't own anything of value until she died. The IRS treats that as an inheritance, and you receive a stepped up basis that means that when you sell, you won't owe capital gains tax (or very little). However, if you were joint tenants in common with no life estate, so that you could have sold your half-share of the home without restrictions, then your mother gave you half the home when you were added to the deed, and you inherited the other half. That means you will probably owe capital gains tax when you sell the home.
Rather than diagram all the different scenarios, get the deed to an attorney or tax specialist in your state and find out what your ownership status was, then we can talk some more.
