Hi Op
I totally get how you feel,
Forcus like other few Posters have said on hygge (danish,idea on how to enhance happier way of living mindset.
Also check out internet/youTube to find out if there are fun activities for children/families to do together ?
Also check out the internet/YouTube you could listen to Children's programmes you used to like watching as child,
A fun nostraglia trip down memory lane,(not sure how old you are?
Also listen,watch your favorite music songs,of when child/teens age yrs and now,and have a mini lockdown disco with your daughter type of thing.
Also when you visit the supermarket why not on a regular basis have a fun cooking session something easy to prepare/cook together.
Also is there any recycle able,easy to get items to make, in the house such as toilet rolls etc,to have a session making things/being creative activities..
Also learn to watch out for things that often take for granted and appreciated.
With your daughter do star gazing often.
And walk in nature,pointing out what birds names of them are, doing such as star lings doing their swirling etc in the sky routine.
Watch sunset,
Watch funny/good comedy TV shows/comedians
Do get into meditation its free,can be done at home,it only takes10-15mins to get beneficial effects of this.
Also mediations is well known to help people think better with Clarity and also very good for dealing with stress,chilling out relaxation.
Also your mental health issue is this purely because of Lockdown restrictions have triggered for e.g Anxiety and Depression then?
Or are mental health issues are to do with Negative emotional baggage from the past still weighed down with them?such as a Crap childhood experiences?or shit toxic co dependancy relantship with ex Partner?or life changing illness/disability ?(often its a case of combination of factors from the past/present or just negative experiences in general ?
Whatever it is really explore/research about different kinds of therapies/theories behind them,
that you are curious/potentially think they will be beneficial to you.
find out if possibly if you can have particular therapies for free or low cost,(even if you pay for them,its worth it with a good therapy that you will not feel bogged down with personal emotional baggage issues..
ps you can have a adapt a health spa session type of thing at home instead...(check out the internet for inspiration..
Also regularly check postive sayings/affirmations on the internet on your mobile or elsewhere.
Even put a good postive saying that resonates you can relate to especially why not put it on your mobile somewhere.
Take care xxxx