To give you some advice, I have also had the experience of having my poems stolen. I was very angry, but there was nothing I could do about it at the time.
First of all, use various platforms to publish your own poetry works, such as publishing, applying for patents, etc. mentioned by the people above; there is also a way to publish it on relevant poetry and poetry websites, and use poetry to Friends, I think if many people use your poems, you must have written well, and if you publish it, you will definitely be well received
Secondly, strengthen your own personal identity, such as your name, should you choose a Pen names with connotations, such as "Tianxia Ba Sing", "Wangyou Mountain Ren", etc. are all good pen names. They are highly identifiable. They slowly build their own brands and are also a means of packaging themselves.
Finally, pay attention to your copyright issues. You must communicate with the publisher in advance if you want to publish. Protected content refers to the creative content and personal identification numbers mentioned above. If you don’t understand anything or what procedures are required, you should understand it in advance. Prevent others from misappropriating it.
Looking forward to the publication of your book, I wish you success!