When I first started using the Libre 6 months ago I had a similar graph to you perhaps not so bad but on some days it was registering up to 7 hypo events and I will assume it may have been like that for years previously without me even realising , I remedied this by cutting my Basel insulin from 17 units to 15 units and now I am going weeks without a hypo event and usually my time in range is about 70 _ 80 % so maybe just a little tweaking might work for you , if my Libre says it is in the high 3s a finger prick usually says low 4s so not to far out .