There's another article which confirms that, for most people on DMARDs, having a booster injection against Covid-19 improves the protection against having the infection and having it severely.
The effectiveness of a fourth mRNA vaccine dose was associated with a lower risk of a SARS-CoV-2 infection to a similar degree among most subgroups of DMARDs used, including patients using biological DMARDs (HR 0·64; 95% CI 0·47–0·88), conventional synthetic DMARDs (0·58; 0·43–0·77), oral glucocorticoids (0·57; 0·32–1·00), and targeted synthetic DMARDs (0·63; 0·19–1·90). Among the small subgroup of patients using rituximab, we could not confirm a similar direction or magnitude of effect (1·37; 0·32–5·86).
ref: November 15, 2023 doi.org/10.1016/S2665-9913(...
There is fatigue amongst us all - too many injections! But keep up your protection if you can and if the vaccine doesn't affect you, personally, adversely.