Welcome to the forum!!! I'm no expert but the yellow leaves with green veins is apparently called "interveinal chlorosis" which is a symptom of an underlying condition.
Not saying that this is the problem but you might want to look at this webpage:
https://aggie-horticulture.tam...
Not a great pictorial, but this webpage has some good text info in it regarding things that cause chlorosis:
https://gardeningvibe.com/cucu...
Best wishes,
Ed
