If you want your public posts to be searchable by their entire contents (not just hashtags), you need to tick a particular box in your profile settings. Lots more info here:
➡️ fedi.tips/how-do-i-opt-into-or…
For privacy and safety reasons this feature is switched off by default. You need to switch it on if you want your own posts to be "full text searchable".
This only affects posts that have a public visibility setting. Posts with other visibility settings are not searchable at all.
How do I opt into full text search on Mastodon? | Fedi.Tips – An Unofficial Guide to Mastodon and the Fediverse
An unofficial guide to using Mastodon and the Fediversefedi.tips
