Larry is correct - Thou Shalt Not Have Two Accounts!
I am level 75 at the moment and wanted to know if it’s realistic to not upgrade and still be competitive.
Certainly not - not reaching fairways and (KIA) not crossing water forbids that!
Also is it beneficial to purchase a 3wood instead of a driver? That way I can use it off the tee and on the fairway? In essence I would get 250yds + 250 yds as opposed to 275 + 205 with an upgraded driver and the stock 3 wood.
This is 100% true - go for it!
The 3WDs are around 35% of a driver and they serve well in double duty - this pushed a thrifty TP (yours truly) and helped me in the first days of Master tier.
Next stop would be one or two short wedges - 50 / 75 yds or 60 / 80 yds to sharpen the short game (third shot).