@robryk If you want it to see your posts in future or have more eye balls on it (or even admins to see it more often in a certain 'category' or 'collection' of tags, then hash tag your post something memorable even your own for the future like #robryk.
My #suggestion is to feel free to add #suggestions and #Mastodon as hashtags
And also notice that #suggestions is more popular than #suggestion (no s on end)...
You can also copy and past other hashtags from other posts ^_^