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I’m sorry - that’s super frustrating! It sounds like you’re doing everything right.
If you are female and in the second half of your cycle you may be retaining weight that will whoosh after your period.
I would stick with what you’re doing. If you’re feeling super stuck after another week or two you might consider a longer fast and then returning to 20:4 and 1400 cal/day.
You may find more specific advice in r/OMAD or r/intermittentfasting. Many on this sub focus on fasts over 24 hours in length.
Wishing you a whoosh!