Just don't have a backyard
I believe OP lives in a condo or someplace without a back yard at all.
I would suggest finding a large piece of farmland and asking the owner -- definitely ask the owner first! If you don't, the BB gun looks very much like a firearm, and the owner might be justified in calling police on you, or even shooting back with the real firearms, depending on how threatened they feel.
Might be difficult in the time of social distancing, but it helps if you are friendly, polite, well-dressed, and have a kid with you.
Do you have any friends with acreage? As limblips said above, for a Daisy, you need plywood at best. Just wear eye protection.
There is a state park near LaPlata that has a public shooting and archery range, but I believe they are closed for the COVID thingy. Doesn't hurt to call them.
Myrtle Grove Wildlife Management Area 5625 Myrtle Grove Rd. LaPlata, MD 20646 Phone: 301-743-5161 Web:
www.dnr.maryland.gov/wildlife/Pages/publiclands/southern/myrtlegrove.aspx Permit required. Shooters must supply all target equipment. Call for more information.
https://dnr.maryland.gov/wildlife/Pages/hunt_trap/shooting_ranges.aspx