How would you say 'by then (future)' in Spanish?

Question

I want to say

"I'll be back home next Wednesday. By then, I'll have become rich."

but 'por entonces' seems a little bit strange - I've never heard it said in the future tense.

How would you say it?

Thanks!

Answer 1

Suena extraño pero es así, "por entonces seré rico" o "para entonces seré rico" se pueden usar las dos formas ; )