My deadlift has been stuck at 405 for forever. I cant seem to builr explosive strength in my quads glutes. Any advice on that?
It's hard to give great advice when you haven't really revealed just how hard you've tried / what you've tried.
Aside from the suggestions, if you want a shotgun approach: if you've never done this, you could try 6 weeks of AMREP deadlifts (warmup and then either 1 or 2 sets at weight) at escalating percentages. IE, something like 60% 1RM + 5% every week until maybe 85%. Your heart rate will be absolutely through the roof but you will get very good at the movement and you will tend to do it at speed because every time you deadlift, you push your HR up and it becomes a bit of a race with yourself.
Every time you do it, use a 1RM calculator to project what your 1RM would be and always try to beat what it projects you need the next week. Yeah, it's a bit bullshit but to me, having something to "rate" and beat every week really does give extra impetus that translates. If you repeat the cycle again, you can just try to beat your last 60% (maybe increase to 62.5%).
Doesn't matter what you do - if you are not gauging yourself, you're not doing it right. You need to be in a competition with yourself all the time. That gives you the bar to beat. For me, there is no heavier session than a damn supposed "backoff/deload" session and there's a very good reason for that - because you know that you don't have to try to beat something and it makes you less prepared, mentally.