If you're post-menopausal, you shouldn't be taking it cyclically (unless you really have to, and have explored all other solutions) - ideally you are taking 100mg every night, continuously. You can also take 200mg every night if needed. (I take 300mg every night, because I like the effects on sleep and I'm on quite a high estrogen dose.)
If you've been scanned to have a thickened lining you need to increase your progesterone use because you are at increased risk of endometrial cancer and if you can't get that lining down, you'll end up having more scans, biopsies etc etc.
You can take the utrogestan vaginally - have you tried that? Many women find that it is not absorbed systemically and they can use it vaginally when they can't orally.
If you can't take it vaginally either, you might want to consider having a Mirena coil fitted which will keep the lining thin without any utrogestan at all... Many women love it for that reason. It has a tiny amount of a progestin in it, but hardly any is absorbed systemically - it stays mostly local to the uterus.
Or, there is the option to go for the Evorel Conti patch which has a synthetic progestin in. It has 50mcg estrogen in, though - which would be an increase from your 1 pump of gel. (It's the equivalent of 2 pumps.)