I think this Bitcoin price prediction for 2021 ($ 100,000 or $ 200,000) is very optimistic.
Yeah, many experts has predicted about reaching price levels between $100k to $400k by end of this year. Also, some people are expecting bitcoin to continue its bull run even in 2022 which means I guess around $400 levels also possible.
As of now, bitcoin is not insanely bullish unlike how it was trading by the times of earlier this year but now it is moving up slow and steady. Usually all slow and steady movements will turn as too faster over the time hence we could expect the same to be happening when FOMO will come into action.
my prediction is for a BTC peak price this market cycle of ~$150K late Dec before a bear cycle starts 1st Quarter 2022
End of bullish trend may happen along with this year end but when considering El Salvador and bitcoin ETF news, then I guess we may have bullish trend till 2nd quarter of 2022 too; we cannot speculate exactly hence we need to be more careful if we plan to book profits at peak.