Been ill - help me find my mojo!

To cut a long story short - baaaad sinus infection, 2 rounds of antibiotics, missed 8 weeks of training mid-Feb early April.

I was having a v solid winter - basically the same training as last year (my first serious year's training) but with commuting 8 miles each way on top and the 2 mid-week turbo sessions cut down from 90 mins to 60. weekend rides were 66 miles all the way through in 4h05 - 4h20, which is both longer and faster (by 1mph) than the same time last year. S0 180-190 miles/week. Plus, making some of the commutes fartlek-y or throwing in sprints had preserved a fair amount of top-end.

Now, however, I feel weak and slow, have clearly lost a lot of endurance, my thighs have visibly shrunk, and my threshold is clearly way down as my commutes are 2mph down on Feb.(I have a powermeter on the turbo bike but have avoided testing as I fear it would be too depressing). I did 37 miles last weekend and felt awful, but 44 miles yesterday and felt OK.

So what to do to recover in time for Aug & Sept sportives? (I've already resigned myself to missing the Maratona this year). I normally find blocks of 3 weeks on, 1 off work for me. All options obviously include slowly rebuilding my weekend endurance rides.

1) Default option - finish current block of base, block of tempo, block of 2x20 sweetspot, block 2 x 20 threshold etc
2) The Lemond option - finish current block of base, then 2 blocks of VO2Max, then sweetspot/threshold.
3) reverse pyramid - finish current block of base, then start 2 x 8 mins @ 3.75 w/kilo, building to 2 x 20 @ same

42 y.o. guy, 1st year serious riidng last year, hit 3.6 w/kilo, 1 sportive gold (Highclere Castle 74m course) , Maratona dles Dolomites middle course 5h51. Longest ride 102m (Polka Dot)

Thanks

Miles