Our bath walls paint is covered with “alligator“ cracks- help!

Our 80 yr old house bath walls paint is covered with “alligator“ cracks with dark molD deep inside. Tried to removed the many layers of paint with elbow grease scraping, chemical remover, and heat gun but most of the cracks goes down to the lath-and-plaster. How do I solve this issue to get rid of the alligator look and what‘s the best paint? Also the tub is now used as a shower and the existing tile only goes up 4 feet, therefore the non-tiled walls do get exposed to water spray.

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