Do you mean?
In this enclosure (enclosed), please make an effort to locate (find) our proposal. Read it thoroughly and carefully (peruse) or else you know the consequences (!). We expect you (kindly) to get back (revert?) to us by next week.
You may think that some words sound professional, but they're not. At all.
In fact, they're dead giveaways that you've copied from somewhere - you didn't learn them in school.
So, do not misuse the following words in your writing:
Note: Revert means to return to a former habit, practice, belief, condition, state, topic, etc.
How about the word "enclose" vs "attach"? Strictly speaking, an email does not have "enclosure(s)" (unlike a letter, parcel, or package). Instead, an email can come with "attachment(s)". Therefore, "attach" is a better choice, but "enclose" is acceptable.
Here's an amended version of the above email:
Better still, why not just keep it simple (and use "I" instead of "we/us")?
I attach our proposal for your review and look forward to hearing from you by next week.
Interestingly, which of these five words do you see in QuickBooks?
Take a moment to test yourself before continuing...
While preparing the above chart, I must have re-designed it a dozen times, or more. It's not perfect, but I have to say "no more" at some point. Here's Parato's 80/20 rule to tame any perfectionist's mind: 80% of the benefit is generated by 20% of the effort. What this also means is that the last 20% to perfection requires an extra 80% of the effort. In the multiple tasks that we do each day, we need to know when to stop.