What made a difference for me was cleaning behind the light fixtures and under the skimmer flap. I didn’t even think to check there, but those spots were hiding slimy buildup and probably reintroducing algae even after I thought it was gone.
Also started doing quick chlorine checks every morning during the hottest weeks, not a full test, just a dip strip. It helped me catch drops early before things got out of hand. I don’t think algae can ever be fully stopped, but staying ahead of it makes a huge difference. Little habits seem to matter more than one big fix.