I believe there might be a hidden message in the decrypted text itself. The reason I think this is that there seem to be filler words added to otherwise ordinary language. Example "I hope you are having fun in trying to catch me". Nobody would use the word "in" at that location in the sentence. If you ask me, something slightly more advanced still remains to be uncovered.

(prior to Dave solving this, I was also taking a crack at trying to solve this puzzle https://twitter.com/BlockJon/status/1292555925564395521)