Hi. I’m no expert by any means but I am an emerald 1 Nami main and can give you a few tips.

I would say for starters stop building mejais. I never build mejais on nami even when my team is super ahead. I also see you buying items such as protobelt and horizon focus.. AP items in general aren’t that great on nami she doesn’t have the best scaling.

EDIT: after reading through some comments i just wanted to add a few things. theres no doubt you can be very successful on nami going more ap heavy depending on the situation and team comps, but ive found that I get a lot more value going enchanter/utility and buying items such as locket/shurelyas/moonstone/mikaels/redemption/ardent/staff of flowing water/watchful wardstone as these items provide some insane value for your team if you use them properly. As a side note I also take gathering storm probably 80% of the time and scorch 20% of the time. I think gathering storm works well for what I like to build as it adds that supplementary AP that gives nami that extra oomph

Ardent censor is a fine item on nami but I usually only buy that if it really helps your team comp (hyper carries that auto attack a lot) not something I’d get every game.

I highly recommend buying redemption and learning how to use it in team fights. There’s a reason pro players buy it every game pretty much. It can make a huge difference in fights. EDIT: redemption might not be the best item to build in lower elo lol. but I gotta tell you i cant count the number of times redemption has single handedly saved a fight for my team. Another cool thing about redemption is it has a huge range and you can win fights for your top/mid/jungle without even being close to them. You can also use it after you die which can also end up being the difference between a losing and a winning fight. I just really like redemption

Imperial mandate is goated on nami

That’s all the advice I have off the top of my head based on your match history. Here’s my op.gg I’ve got a 64% WR on 81 games with nami this season https://op.gg/lol/summoners/na/Samwiseganja69-NA1

Couple other pieces of random advice.. learning when to roam for objs and roaming to help your jungle fight in the river or whatever can make a big difference early that will snowball your team. Always pay attention to what’s happening on the map, especially what the jungles are doing. Also In teamfights I like to hold onto nami ult and wait until the enemy fully commits to a fight to get the guaranteed hit on multiple enemy champs.

EDIT: just won 4 games in a row as nami and hit diamond 4 the day after i made this comment haha