Ending a sentence with "just" is short for "just fck my sht up". https://knowyourmeme.com/memes/brendan-frasers-alimony-just-fuck-my-shit-up https://knowyourmem

Ending a sentence with "just" is short for "just fck my sht up". https://knowyourmeme.com/memes/brendan-frasers-alimony-just-fuck-my-shit-up https://knowyourmeme.com/memes/brendan-frasers-alimony-just-... It's meant to convey a sense of defeat. So in this case the sentence would read as implying that the author wanted Mastodon to replace Twitter but that it's not able and that fact is causing her emotional pain.