Many have come up with logarithmic graphs and exponential values etc.

For me if Bitcoin follows this type of yearly doubling trajectory I'd be more than amazed and it would obviously make most current holders very rich.

2014: $125
2015: $250
2016: $500
2017: $1000
2018: $2000
2019: $4000
2020: $8000
2021: $16000
2022: $32000
2023: $64000
2024: $128000
2025: $256000


Considering the value is well into the 4000s already I'd say the current value is indeed already very high.
If its value doesn't reach into the upper 1000s ($8K or so) before 2021/22 I'd probably cash out if possible and forget about Bitcoin, but if the value increases anywhere near the likes of the above figures I'd definitely HODL for a long time. There have been very good indications recently that growth can continue. In the moment the waiting might seem endless but looking back Bitcoin has rocketed like mad in a short timeframe and increased percentage wise far quicker than my guessing figures indicate.

I'm definitely HODLing for now.