Taking nothing for granted, what is a reasonable forecast for Bitcoin by the year's end?
If I were to focus only on price, then I would personally say that I do not expect the price to go lower than what has repeatedly proved to be a strong point of resistance, and also the price at which it ended last year and started this year ($29 000). The upper limit is much harder to determine, because since the last halving we had a new ATH at about $65k (from $7000), which is almost x10 - and some speculate that this is actually the absolute maximum of this cycle.
Assuming this is not the case, it is not unrealistic to expect that by the end of the year we have another big bull run that could be 50% or 100% of the current price - which coincides with the desire of many to reach $100 000 by the end of this year.
All of this of course depends on a lot of things, because Bitcoin is not isolated in the market, we saw that when it crashed with everything else last year. The overall state of all markets, good or bad news, regulations, and policies, all have their impact on Bitcoin.