You should scrub all that glue off the build plate which may be a chore in itself depending on the glue. With a scrub brush and some serious degreasing soap.
If the glue doesn’t want to come off, try IPA
That build plate looks bad. If it initially printed fine, chances are that if you get the plate back to clean, with no residue, it should print like it used to.
What filament are you using? Have you modified the printer trying to get it to print?
What nozzle are you using?
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