I’m not really good at romance writing or reading as fantasy is my destiny and I prefer drama 
, but these few could be helpful:
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There are 2 types - slow burn and fast burn and 3 types of readers - likes slow, likes fast, hates romance.
You have to decide which one you’re going for:
slow burn - first kiss after 20+ episodes
fast burn - kiss before 10th episode -
Choose your trope - enemies to lovers(my fav), besties to lovers, friends to lovers, etc.
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Don’t use cheesy pickup lines or something that is in every romance story
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Making MC and LI meeting meaningful and not random running into each other on the street
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Make MC and LI go through some things where you can see their struggles and how they overcome them.
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Make a great and unique backstories
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I personally love art scene use in stories but they are not necessary.
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Make every moment full of emotions
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DON’T USE NARRATORS TO TELL ALL BACKSTORIES OR “My name is …, I’m … years old and I live in…” People like to explore the characters not read everything on a white plate.
You could also check out this thread.