There is nothing like being on a call when the product isn't working right and the customer has 28 people from their side and only 2 of them know anything about the subject, but 26 of them have very strong conflicting opinions.
This is the way.
There are back-doors as well. If you can get your software on a pre-approved vendor list in a big consultancy you can by-pass a lot of the song and dance with IT. Companies like Xerox have lists like this. They sign long-term contracts with enterprise customers whose business units can use their part of the budget to get any of the software on the list.
All you have to do from there is market to the right people running those business units.
Selling through the normal IT channels is much harder. It can take 6-9 months of back and forth and you'll still likely get denied more often than not. Enterprises would rather contract with a vendor like SAP, Xerox, Microsoft, etc which is all integrated with their systems already and has the advantage of the Lindy effect in place.
Or, if you're less lucky, you'll left with software you can't maintain. Even if there's a contract clause that says you get all the yummy, yummy source code. You may not even be able to open source it because you don't own the copyright to some or all of the code. You just have the source code. Good luck with that.
No one gets fired for buying IBM because you know (or at least we once knew) IBM would definitely be around for years to come to support the product. Is it expensive? Yes. Have I found a lot of enterprise products miserable to use? Yes. Does everything have the stink of "well we made it work well enough not to get fired?" Yes. But you won't be getting extorted Broadcom style, or sitting around with 5,000,000 lines of AI generated source that has all sorts of hacks and work around for the four other companies to whom the startup sold their software.