Natuarally, Bitcoin ROIs have been shrinking over years and market cycles so with most optimistic view, my prediction is only x2 (100% ROI) for each of next two market cycles and I believe in future market cycles, Bitcoin will not increase more than x2 from its price as ATH of a previous market cycle.
You can check history of Bitcoin ROIs in past years.
https://www.casebitcoin.com/Although bitcoin has increased significantly and brought 8x returns to those brave enough to buy bitcoin at $15k during the 2022 bear season. But if we compare the ATH of $69k of the 2021 bull season and now, bitcoin hasn't even reached x2.
Yes, bitcoin has become big and its ROI is decreasing over time. Expecting x2 or less growth per bull cycle is realistic and I think so too. I don't believe bitcoin can increase x5-x10 as many others expect.
It can be said the era of getting rich quick, making big profits with small capital with Bitcoin is over, we are no longer in the early stages.