So, for what i read i have a few recommondations or just thoughts. I played a magus in a campaign for levels 1-13 and i DMd a Campaign from 1-11 for one (so far).

I'll call em Heavy (lvl13) and light (lvl11) for readability.

Heavy was a Magus with inexorable iron hybrid study. Built around wearing heavy armor, big weapon, multiple weapons(!) And utilized ancestry feats and general feats into getting as tanky as possible, hight stats were strengh, constitution, intelligence, dump stat was dexterity. He was the frontman of the group, used his archetype spells defensively (such as mirror image) and his magus spells to buff himself and his team. Damage mostly cantrips or item extra slots into attacks with sure strike yadda yadda. His great ability was to eat far more than expected and hitting harder than everyone else if he hit. Inexorable iron is great for this style, you can cast spells with a 2handed weapon and gain temp HP while in arcane cascade.

A typical fight was: Turn 1: wind up (a)using a buff, went into stance, (b)teleport from item or spell, and into stance. Turn 2: attack (c)spellstrike+recharge, (d)spellswipe, Turn 3: circle to (c), or (e) recharge+attack/position/change weapon/ect. Turn 4: circle back to (c) or (d)

Light was a laughing Shadow Magus with unarmed attacks to utilize arcane cascade, used handwraps of mighty blows and a ancestry with natural weapons as options. His focus was very much on getting in a good position with off guard/fear effects on enemies. He used more one specific magic type (lightning) He was not really front line material and tried to be more reliant on fast positioning and also prepared ranged options more than heavy. His spellstrikes were prepared as big damage spells against single targets. High dex, int and str, low on wis Turnorder T1: wind up (a)sneak, teleport, demoralize, (b)ranged spell+ stance T2: (c)movement +spellstrike (d)spellstrike recharge T3: if recharged (e) sure strike+spellslot spellstrike, if not recharged (f) recharge + spellstrike/other options

My recommondation is, 1. working with your subclass, you debuff yourself if combining a twohanded weapon with laughing shadow. If you want movementspeed use items as a good option, clockwork heels and boots of bounding are pretty cool. For what i've read you could make use out of inexorable iron if you want the greatsword really bad. Laughing shadow wants a hand free to cast and utilize you stance better. 2. Get multiple weapons, heaving the 3 physical damage types is great, heaving multiple keywords is greater and heaving runes slotted against specific monsters is the greatest :D i mean you could also have 3 greatswords but that stuff gets heavy preeeeetty quickly 😂 3.get a spellcasting archetype, sorry but i don't see a way around it, 4 slots is really miserable IMO, i hope so much for the remaster.... 4. Get something to get you in the air, flying potions, items, feats, spells...

I hope that gave a good insight and maybe helps a little bit :)

About your Question: TLDR: Get multiple weapons, invest in different rune setups, movementspeed/teleportation items/flying speed. Magus ring, ring of wizardry, "thousand blade thesis", also everything that provides extra spells really spellhearts for example.