You could just put one tag on your art/craft/creative work, and that tag could be #art, and it would come across my feed.

Tags aren't used here to boost popularity of a post like they are on insta. They're used for people to find content and accounts that are insteresting to them.

Use tags that are directly relevant to your work - anything else is irrelevant and just eating into your character count.

Honestly. If someone's looking for general art - any art - they're going to type 'art' in the search box and find posts tagged with # art. That's it, they've found you.

You don't also need # MastoArt FediArt Artists Artwork or any other generic art tag. Let me repeat that: You Don't Also Need Any Number Of Other Generic Art Tag. I promise you. One is good.

If you paint watercolour, chuck a watercolour tag on for anyone looking speficially for watercolour.

I know it's a very hard habit to ditch using All The Tags in the way Instagram and Twitter force you to do to try and maximise eyeballs on your work but fedi just doesn't work like that. There are no algorithms. It serves absolutely no purpose at all taking up half your post with 20 hashtags that are all variations or extensions of the word 'art'.

If you're posting photography, use that, use one for film/digital. Use one for a photo community if people might be looking for other members. Done.