#BTCBackto100K

The cryptocurrency community expects or hopes that the price of Bitcoin (BTC) will return to $100,000

This reflects confidence or optimism that Bitcoin will rise significantly in the near or distant future, especially after periods of decline or strong market fluctuations.

This hashtag is often used when:

Positive news is released (such as countries or major companies adopting Bitcoin).

The Bitcoin Halving occurs, which reduces the amount of new Bitcoin and affects the price.

There is an increase in demand for Bitcoin from major financial institutions.

There are comparisons between Bitcoin and gold as a store of value.

In short: it is a slogan from those optimistic about Bitcoin returning to a very high price ($100K), expressing ambition and betting on a market rise.