Main thing that it looks like we need to talk about is how level requirement on items matters in terms of damage.
Using 51 ee level 20 dagger at level 39 is more like using a negative 10 ee dagger. a level 35 dagger with 0 ee is doing more damage than your current one.
I explain this is more depth here:
https://forums.d2jsp.org/topic.php?t=82816922&f=74But basically you should need to upgrade your weapon at every 10 levels minimum.
Also, seeing you've picked a rogue and correctly went for dex ratio weapons, these being Dagger/Staff/Axe. Swords and clubs are usable but need significantly higher EE to get the same result. Again it's shown in the first link,
But i recommend you don't limit yourself to daggers.
Currently SZSZ has been doing pretty decent deals to newcomers for Daggers, so you can try asking him,
https://forums.d2jsp.org/topic.php?t=88420536&f=273If he can sort you out a 35/45/55 for around 50-150 fg, you'll be doing well.
Lets talk armors. The issue with buying EE armors for a rogue is that EE non padded robes give terrible defense and not worth using. EE padded robes arn't too much better until we reach numbers which come out of your price range. This leaves 30-80ee leathers/scales, which in general do not drop very often so are generally unavailable.
So in general i recommend rogue users to try and buy a level 35/40 leather/scale with ~30ish dex and a level 50/55 leather/scale with 30ish dex. Both of these should only cost about 20 fg each as they are beginner gear.
Also you quite desperately need a semi decent dex charm, anything 20 dex+, should be worth looking at.
currently there's a 24 and 23 dex for 10 fg each and a 34 dex for 15 fg, i'd highly recommend the 34 dex one at 15 fg.
Note the level requirement on charms DOES NOT MATTER. The only reason it matters for armors/weapons is the defense increases on armors and the damage increases on the weapons. For charms the spellcasting damage increases and seeing you are not spellcasting, means a higher level one will not be of any benefit. In fact it's worse seeing when you complete a MQ your level gets reset to 1, (staying at high level does not give any benefit to new players).
Also as a rogue all points should be going into dex and vitality.
So in short:
Need a new dagger level 35 or 40 with 30+ ee, try talking to szsz in the second link
Buy a 20+ dex armor for level 35 or 40, currently just 1x on the market 28 dex level 35 leather for 19 fg.
Buy a 20+ dex charm, there's a 24 and 23 dex for 10 fg each and a 34 dex for 15 fg,
I am keeping your budget low, it's upto you if you fancy paying more for better gear. Feel free to pm me for price checks if you start looking around at other items. Whilst SZSZ may sell you an ~70ish ee dagger for between 20-50 fg, you're probably going to have to spend 200+ for 100ee+
A few players will attempt to rip you off, as we have multiple resellers who buy cheap items from the MP aimed for new players and attempt to sell them at high prices.
Finally i suggest you keep any old items the entire gameplay of ladder slasher is to repeatedly get to the Master Quest to try and unlock the next class (everyone has an equal chance of getting new classes, this is not gear dependant) as i mentioned, completing a MQ resets you to level 1, so completing a gear set so you have items to go from level 1-MQ is generally recommended, this is my club/strength setup:
https://forums.d2jsp.org/user.php?c=3&i=193561&p=29506Good luck!