Looking for advice on how we can fix this?

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Hi All,
Looking for some advice on how myself and DP can save our relationship. Brief background we have been together 6 years, no children, not married, living together for 4 years now. Up until 6 months ago where very happy together and still are a lot of the time but slowly we have got into the habit of endless arguments about stupid things, resentment and not communicating it has got to the point where a lot of the time its like we are platonic housemates.
This all came to a head at the weekend after yet another fight and I told him we needed to work out what was going wrong and change it or accept that this wasn't going to work any longer. After a long discussion we established neither of us want this to be over but are both feeling a bit like the other has lost interest, resentful of things the other does etc. we decided we really do love each other and want to make it work. The issue is I have no idea how we get out of this cycle of snapping and fighting.
For some background context on my end at least I moved country for him 2 years ago so he could take an expat job, I also work here but due to corona have worked from home for over 12 months and as a result have a very very limited social life here. I guess this is why I am often not particularly sensitive to his feelings.
On his end he goes out to work still each day and works long hours in a stressful job, he says this is why he is often snappy and stressy at me.

You have forgotten to laugh.Thats whats happened OP. The daily grind,the pandemic,the not so new normal has totally gotten in the way,It leads to anger,resentment.frustration and snappiness all round,The feelings you both feel are just a reflection of all that is wrong in the world right now and is probably no definetly not aimed at each other,but we often take out our feelings on those we love the most,We dont mean to but we do. I see nothing from your post that cannot be fixed, A little effort from both of you and you can get over this you really can, My suggestion for what its worth? I prescribe a weekend away from home,turn off your phones and go and have some fun together,You can do anything from sitting eating fish n chips on a wall in the sunshine to getting lost in a forest! Anything you want just a complete break,Maybe even going back to doing something you both used to do when you were dating?It doesnt even have to cost much, Go to the cinema anything at all but you both just need to be together doing something together away from routine,Its been so hard and when you are both tired and stressed we say and do things we dont mean to and hurt the very person who we should love and rely on the most, I used to put a note in my husbands sandwiches just saying something like I know I dont tell you enough but you are amazing and I love you...it goes a long way as daft as it seems! You both need some fun and to remember the good things that bought you together in the first place,What about a picnic at midnight on the lawn? Do you remember when you both used to sit and talk for hours not wanting to sleep cos you couldnt bear to be apart way back in the early days? Make it happen and I am sure all will be well, One event in our house when we were like you are now was the surprise of me joining him in the shower ,,,well to be frank it wasnt as sexy as I had hoped but it made us both giggle and its daft things like that that help,,give it a try! Good luck xx

Thankyou @lazylump72 I think you are completely right one of the things we discussed is that we don't talk these days we've got in the habit of eating dinner then just doing our own things and then when we do talk it leads to bickering. I think part of the problem here is the pandemic means we have nothing to talk about but work and as we both do technical jobs neither of us understands much about what the other does.
We mentioned perhaps banning phones from the dinner table and also trying to get back to walking the dogs together each morning which we did when we first moved in together and over the years it has faded into whoever the dogs manage to wake up first grabs them and goes. Thinking back that was often my favorite part of the day as it was 30 minutes of just chatting before anything had managed to stress us out or put us in a bad mood.

Ok so you have a starting point.Why not both of you reaserch together somewhere you could take the dogs for a walk,Has to be somewhere new for you all to discover together? It opens up planning,talking,deciding,which turns into a dog walking date! Stop off for a coffee or pack a drink to take and you are then both off on an adventure at the time of your choosing.It would be something to look forward to and its a start.Go for it! Sure you will be fine.x

Thankyou @lazylump72 its good to hear you don't think its all doom and gloom. Going to do what you've suggested and also maybe try and plan a trip away asap. We have had 3 holidays (within country) cancelled in the last 12 months.
You are 100% right that we need to learn to laugh again, I need to find the person who used to laugh at things going wrong instead of getting stressed and snapping.