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I mess around with my dobro and also Pedal steel. I have always used metal finger picks. You can use needle nose pliers to shape them however you like. I currently am using Stainless steel open design finger picks that I purchased on Amazon in2023. Just checked and they are still selling them. I bought the large size. Most old timers use national finger picks.
You can shape the plastic ones by putting them in heated water until they are pliable and then u can shape them.
Trim your finger nails fairly close to your finger and shape them to arch around the shape of you finger tips. you can probably find to some your tube instruction if you want to explore more. The way I use them is called claw hammer finger picking style. Your fingers are curled in toward your palm. It is very easy to use muting with this style of finger picking.