Thinking of buying a brand new set of golf clubs

OK, tall people don't necessarily need longer clubs. But, most do, and you are probably in that bracket. I'm 6 2, and have played for 35 years. Back in the day, custom fit was for pros. It just was. I played for years with standard loft, lie, length. I got down to 12 handicap.
I changed to what I was fitted for, 1/2 inch longer, plus 2 degrees upright. May be came down a couple of shots. May be this was down to a better short game, GPS, more confidence, who knows.
What I do know, is that my 1/2 inch longer clubs feel way more comfortable to swing. I have tried swinging my older irons, (I have 8 sets, of all ages!), and ones that are longer than standard are easier to hit.

It won't solve all your problems, but you will know that it's not the club's fault. At your level, almost any club will do. Heck, guys my age had to learn with blades. If it's fitted for you, then it will help, a lot.