I don't think anybody is legitimately saying that voting blue is the end of the matter. Activism is way more than that--it's attending local board meetings and making yourself heard, getting involved with your local/state parties to push for change, communicating with your elected representative (even, and especially if, they disagree with your position), attending donstrations and protests, volunteering for your preferred candidate's campaign, voting, and most importantly--never giving up, even if it takes decades. If your preferred candidate loses in the primary, you immediately switch to the next closest candidate and start campaigning for them and pushing them towards your preferred policies. If a referendum you support loses, immediately start pushing for a similar referendum in the next election that tweaks the wording to avoid the reason why it lost last time. And so on, and so forth, across all the various levels of government.

This exact playbook is what got Roe overturned. Religious mutters pushed, and pushed, and pushed. They voted in lockstep for the farthest-right candidate in the primary, and if they lost in the primary they voted for the farthest right candidate in the general. They protested outside abortion clinics daily. They pushed and pushed, and over the course of 50 years they gradually transformed an entire political party from having roughly equal representation of pro-choice and anti-choice candidates to one where supporting a nationwide 15-week abortion ban with no exceptions is considered "moderate."