See I have no problems with my energy levels, I sleep well (cycling commute and busy work help that!) it's the recoveries and fatigue I 'struggle' with. Soon I want to try 2 big rides a week (20-30 miles) with 5 days of commuting (total of 40 miles) to break through the '100 miles a week' barrier. I'll be taking 1 rest day a week, is that really enough?
If your commute is only 4 miles each way (if my maths is right) then I wouldn't even worry about recovery tbh. You're getting enough.
The only way you're going to get less fatigued is to push harder to get your overall fitness up. Do longer rides to get more endurance and harder (faster/steeper) rides to get more strength. Worrying about anything else at this point is unnecessary.
My progression for example was pretty much this - no specific training plan or diet or whatever:
1) MTB commuter doing maybe 5-10m each way. Relatively flat.
2) MTB commuter doing 10m ish each way. Relatively flat.
2a) Started doing weights - Loved doing squats and deadlifts. Dem quads/glutes.
3) Road commuter doing 10-15 mile ish each way - Relatively flat.
3a) Still doing weights.
3b) Started going out on weekend recreation rides - Relatively hilly (sucked at first but gained strength quickly.
4) Road commuter still doing 15m ish rides but altering commute to take in a decent hill climb on the return)
4a) Still doing weights.
4b) Still doing weekend rides with ridiculous hills.
5) As above but doing long sportives.
6) As above but doing things like a solo 100m ride and going to Majorca to climb mountains (inc 85m 12,000 total climbed ft ride).
7) Quit cycling for a year...
At no point during any of that did I take my diet/recovery properly seriously. Just eat more, ride more, eat more, ride more. Mid ride weekend snack was 3 cakes and a hot chocolate at the cafe. Pete will vouch for that. I was overweight but had bags of power to make up for it.
Anyway, long story short, don't worry about it. Just fuel up well and push hard. The rest will come.
