These are the things that have worked for me this year. I'm down to 63kg and I haven't drastically altered anything in my life but lockdown has allowed me to reset a few areas. I'd describe my will power as non existent, so for me its been a big struggle to make small changes.
Go cold turkey on sugar and crisps for 1-2 weeks. It's only when you have something sweet again do you realise how quickly the cravings start. It was a real eye opened for me.
Don't feel guilty for having a treat. The more you avoid it, the more you feel guilty for having succumbed to temptation.
Look at how much small changes can add up. It might only be 1 small chocolate biscuit bar a day but drop to every other day and that is around 1lb loss (or not gaining) every two months
Ask your partner to buy the stuff only he/she likes and keep that where they usually live. Then set yourself a snack tin somewhere for the stuff you like. It might just be me, but if I know I have x amount stashed away then I am not thinking about sharing something. It's also there when I want it, with no disappointment of the last one having been snaffled. If I look in the cupboard, there is nothing I like and that is a reminder why my stash is hidden away.
Change your wardrobe as your weight goes down. No point in staying in the same clothes as you have enough room to comfortably grow back into them.