Your pattern is really similar to mine, @EchoNova - small losses followed by a bigger drop rather than steady by week.
Things that are really working for me (and I've noticed the weeks where I've lost a lot have been the weeks when I've really stuck to these rules as much as possible):
Keeping to a 16:8 intermittent fasting pattern - which also works in terms of not eating too late and having my dinner mostly digested before I go to bed
Maximising sleep - definitely has an impact on my weight loss, no idea why. And being in bed by 11pm. Late nights seem to fuck with my eating habits the next day.
Eating round my plate, starting with protein, then vegetables and then complex carbs (mostly lentils and beans). Other carbs largely get left because I'm too full by then. I seem to not be able to eat things like bread, pasta rice and potatoes without slowing my weight loss a lot, so they need to be deprioritised!
Eating lots of fruit - I don't have much of a sweet tooth for puddings but have a bad habit of snacking on chocolate or ice cream in the evening at the weekends. I've replaced that with fruit, which I keep chopped up in the fridge (mostly orange segments, grapes and pomelo) so its nice and cold and easy to just grab.
At least 8 portions of fruit and veg a day, preferably 10. I know that sounds like a lot, but it's actually not that hard to do if you replace half the carbs on your plate with vegetables for both lunch and dinner, and snack on crudités and hummus if you need an in-between meal snack. Seems to help keep me regular as well!
One small portion of greek yoghurt a day after lunch (which is always protein plus salad, or protein plus a cup of vegetable soup), with nuts and seeds in it to increase protein intake.
Daily exercise even if it's just walking 5km after work. It doesn't have to be anything too strenuous to have an impact for me - if anything, I have to remind myself not to eat all my calories back after a run or weights session, whereas I don't feel the need to fuel after walking.
Logging everything on MFP - including weighing it all.
Writing this all down because there will be times when I'll stall and need to remind myself what works.