Hi,
there are a couple of ways forward. You can use CGM with alarms as your post asks advice on, or, regain your hypo awareness.
For the first one, I use dexcom's G6 system, sensor. transmitter and my Samsung S7. No calibrating, pretty accurate and good alarms when low or high. Read out and vibration alarm, available via bluetooth, on a smartwatch (I use a Huawei One watch). Cost, apologies for not knowing your financial circumstances or availability where you live, runs at £160 a month. Watch and phone extra.
The other way would be recovering your hypo awareness. There are a lot of articles and so on, should you run a google search on this subject... one of those may give you the answer you search for.
I wish you well and hope this helps.