Think a lot of people will be in the same boat. I was getting really fit, lots of walking in the hills and hitting the gym 4 times a week, I'd lost 15lb since the end if the first lockdown.
Then lockdown 2. Gyms closed, only local exercise, etc., Christmas and now $hlt weather
. I think you just have to be realistic with your goals and don't beat up on yourself if you slip. Just keep getting back on the horse.
I still get out walking on my own but as I don't live near the challenging walks its all a bit sedated. I do find filling in dead time with exercise works. e.g.. I do press ups / sit ups when the bath is running, waiting for the toaster or kettle etc. or when TV adverts are on. I'm rocking out a few hundred a day which really works for me.