Not sure what to tag? Here are some recommendations!
☕ Introducing yourself: #introductions
☕ Showing off your vocalsynth collection: #vocastock
☕ Art: #vocaart (optionally more specific #vocaloidart, #utauart, etc.)
☕ Music work: #vocaoriginal / #vocacover ( #vocaloidoriginal, #utauoriginal, etc.)
☕ Cosplay: #vocacosplay (etc.)
☕ Recommendations: #vocarecs (etc.)
Also, tags like #mastoart, #fediart, #mastomusic, and #fedimusic help get your work outside VocaLounge!