I find a lot of parents just never want their child to feel any pain or discomfort and it’s not good for a human to live like that
This is key. Ds used to moan when we walked a 20 minute walk locally but would walk 10 miles in Disney World without a peep. When he moaned I told him it wouldn't change anything, yes he has already told us he doesn't want to do it and we are still doing it. I also told him I don't want to do laundry and yet it has to be done and I don't constantly complain out loud. Show them adults don't like doing stuff either.
Building resilience is important, you can't always be first, you can't always be the smartest or fastest and win every game. Therefore when I lose a game I demonstrate being a good sport about it, when I win I am happy but not lording it over anyone. FIL wanted a print out of scores when we went bowling, Ds1 was 3 and used one of those rolling ball helper things, hardly a fair competition.
Put your phone away, they are only with you in an evening for a short amount of time, be present because when you are in it it feels relentless and you come out the other side, they are suddenly mid teens and you realise you can never get that time back.
Please help your child learn their times tables (said this to the same child as I followed the year group from yr2 into yr3 into yr4) help them learn their spellings and listen to them read, also read to them. They will have to read all the way through primary and into secondary, pull out information, form it into an essay an argue a particular way. Talk about the plot, the characters, why Joe is sad, why Mary is mean.
A child is also more likely to be sad and not depressed, they are worried and not anxious. It is okay to be okay, you don't need to be happy. Contentment is key.
And finally, please do not say you hated maths or school in general in front of your child. We are trying to help them learn maths.