Not in next 3 years, next ATH will happen sooner than that. In fact it is just few months away. BTC has attracted institutional attention and now price increase will happen in big slabs.
Like $10k price up within a week.
The institutional investment in bitcoin started a long time ago and it is nothing new, there might be more reports coming out regarding their investment now than ever before and these institutional investors are advertising about their investing to the public through social media as well and for people like me i would think why would they do that, will they advertise when they will book their profit as well

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Well there are institutional investment firms that usually released a quarterly or monthly report so I guess that's the time we will know if they have sold their reserve assets on bitcoin or not. But majority I think won't reveal their holdings on the first place so obviously we wont' here then selling and booking their profits as well.
In any case, a new all time high will again be breach, just a matter of time. Of course we are glad to see another high at around $50k or more in the next 3 months.