Intermediate lifters GTFIH

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>ruined my sleep with coffee many many days in a row
>feel like shit at the gym, failing 170 kg for 1 rep when I did 190 kg for 1 rep recently
>about 20 months ago I did 170 kg for 10 sets of 3 reps
>shit diet and sleep since then, barely progressed

1. Incredible how much I've fucked myself. Any other intermediate lifters here? Is 5/3/1 good enough? How long does it take to recover strength if giving up coffee cold turkey?

Going to the gym to lift low weights is just boring.

2. Do you think volume matters? Is everything except for the main lifts at the heaviest reps (like 5/3/1) just fuckarounditis?

My stats

Weight: 107 kg (approx, and I binge on junk food everyday so hopefully I will stop that today)

All these 1RMs were in April
S: 190 kg (also 185 x 2)
B: 114 kg
D: 230 kg
Ohp: 88 kg