If we deny ourselves and our loved ones the right to show our real feelings, our optimism becomes toxic. ¿

I'd also go with "optimism" there.

If we deny ourselves and those close to us the right to express our true feelings, then (our) optimism will become toxic.(??)

(By the way, I wrote that before I saw your version, so it's my true first impression)

Great I managed to steal some things from you before you did that.))
Thank you very much!))

Улий, добавь перевод, пожалуйста! 😉

I forgot to ask you: WILL doesn't imply the future there, right?