You can set the minimum extrusion width to a small value (20-25%) for better fill. You could also use classic mode with gap fill. You can use ironing for both to improve the results.

Does your slicer have Arachne slicing mode? It will use variable extrusion width which will help to prevent most of those gaps.

Your first step will be learning to dry it and keep it dry. I can recommend a scale that can resolve to at least 0.1g so you can measure the weight loss while drying. This will help in seeing when it’s sufficiently dry (put it in dryer and weigh it every hour) and if it took moisture again.

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