Is being forgotten really a fate worse than death?

this will answer all your questions on said subject

Here's a relevant Kurzgesagt video, Optimistic Nihilism

The TLDR is that being forgotten is going to happen either way, especially if a Great Filter is still in our future. So you can either wallow in the thought that you'll be forgotten, or find it liberating in that time will remove your mistakes.

It's like looking back to high school. Your mistakes only haunt you; most people don't remember many (if any) of your mistakes after 10 years.

99% of us will be forgotten after 100 years there will be no trace of us on earth and in memory of anyone in the universe of existence the existence of a single human unit is irelevent