@yueplushart #Welcome! You seem off to a good start. Some things:
* Add alt text to images. It doesn't have to be long, but it should describe the image and point out any highlights. Fediverse is much about accessibility; adding a descriptive alt text greatly helps image accessibility. Many won't boost or interact with posts that have images lacking alt text.
* Post an introduction, tag it introduction, and pin it to your profile. Look through that tag for some inspiration on what to include.
@yueplushart
* Including appropriate hashtags in your posts increases discoverability.
* Follow! If you see someone posting something you like, look at their profile and consider whether you want to follow. Also look at and follow hashtags. Use filters/mute/block/unfollow as necessary to curate your feed. Mastodon doesn't push content to you, so you need to seek out that which matches your interests.