What’s the meaning of spread thin?
You say that you’ve spread yourself too thin when you’re trying to do too many things at the same time and therefore can’t do any of them as well as you would like.
When using the phrase “spread yourself too thin” in different tenses, bear in mind that the past tense of spread is also “spread,” not “spreaded” (i.e., the simple past tense and past participle forms of “spread” are both “spread”).
Won’t you be spreading yourself a bit too thin if you join the debating society too?
Have you tried QuillBot’s free Paraphraser? You can use it to find alternative ways of expressing “spread yourself too thin” in your specific context.