Sadly you have a known issue with the newer 15” models as well as the 13” Fn system as both have undersized cooling for the system so the T-CON board which is sandwiched between the cooling fins and the heat sink over heats! This degrades it.
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At this point you need a new display assembly! [product|IF117-064-7] and here’s the guide to put it in [guide|123893]
As to how to prevent killing your new display, you’ll need to get a good thermal monitoring app like [https://www.tunabellysoftware.com/tgpro/|TG Pro] as you want to push the fans harder when you are running something that requires more CPU or GPU load.
You also want to make sure your fans are not choked up with dust as well as the system as a whole. And make sure you are not blocking the vents or place your system down on a surface which has loose fibers which will clog up your fin areas of the cooling system.
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