I have a bit of a storage problem.

Why not use them and catch some stuff for dust and exp? Or trash some pots.

Evo items? Berries? FTMs? Balls? Honestly hard to believe you can be that full with no rare candy to spend.

Assuming your items are anything like mine, find some team gyms and feed as many berries as you can.

I don't know what else you have in the bag, so it's difficult to say exactly what you should get rid of and what to keep, but do not under any circumstances get rid of the lucky eggs (unless you are at lvl40 and don't care at all about xp, but that doesn't seem to be the case). You paid for them (I guess) and you can't get them from spinning Pokestops.

I think you can get rid of a few Max revives to start with. I doubt you need that many.

I also struggle with not having enough space in my bag. Seems like no matter what I do I always reach 1500. I once got rid of some berries and used up 50 rare candies and not even that last me very long. Thankfully I used up some balls during the Community Day and the Pikachu outbreak, so that left me with like 200 empty slots. But now I'm back to having almost a full bag again.

That is less than 300 of your items. Hard to say what you should discard without seeing the rest. You probably either have more balls or berries than you need. Also you could start with the revives or potions. You likely don't need that many of both of them, as max revives eliminate (some of) the need for the potions. Find a gym of your teams and feed as many berries as you can to get the stardust/candies instead of discarding.

I had a similiar problem when turned L40. First thing I did was to throw away all the lucky eggs, then a good number of revives and potions.

Without knowing the rest of your bag, playing density, and activity it is hard to advise.

If that was my bag, I'd use the Max Revives down to 20, keep 20 regular revives, 20 Max Potions, then 20 potions of whatever choice.

Rather than dump the Lucky Eggs, would suggest using 1 a week or something, to evolve the catches of the week. More, if your catch rate frequency allows.

Looks like you are carrying too many golden razzberries. Or other berries. Anything more than 100-150 range is absolutely unnecessary.

Save the revives and potions in case you chain raid or gym fight.

Some level 40s compete or tries to get more exp to make into the verified level 40 club, so if you tries to go down that route, lucky egg will be useful.