Wiring is difficult to see without clear description of each wire inside the box... and more difficult when folks take wiring apart without taking photo of wiring before starting. Then they throw away the old switch,,, so comparison cannot be made to new switch.
That being said:
Did you install a new 3-way switch?
Is it a 3-way switch with 2 brass screws and 1 dark screw and 1 green screw? The dark-colored screw is common screw.
If you installed new 3-way switch, then it is probably wired wrong.
Or there is damage to a wire that is not covered with repair... or both bad wire and wrong wiring.
Look at OLD 3-way switch and identify which screw is the common screw. Should be marked on back of device.
Identify which wire went to common screw on OLD switch.
Look at NEW switch, and identify which is the common screw (dark-colored screw), and then attach OLD common wire to NEW common screw.
Otherwise, put old switch back into box... see if it works... take some photos... attach photos to comment to this thread ... take photo of new switch from back, showing all screws so I can see what is going on.
We can fix it it...and I will be here all evening to assist.
Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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