My Sim2 Max driver with the Ventus Blue Velicore shaft. Never lets me down.

At least I know when I'm over 14 😉

Sim2 Max Ventus Blue Velicore R 10.5 Sim2 Max 3HL fairway Tour Edge Exotics 4 hybrid Callaway Apex 19 irons 5-A Kirkland 52, Callaway 56 and 60 wedges Bettinardi Queen Bee putter (from Costco)

Find a teaching pro, in person or on-line, and get a lesson. They can look at a video of your swing and give you some changes to work on that will very likely make a big difference. The basic cause of a slice is that the club face is "open" relative to the swing path. This creates spin that causes the curve (like in ping pong, if you ever played). Your hands control the club face and your arms, upper body and foot position mainly determine the swing path. Lots of variables and a trained eye can help you find ways to improve.

I have purchased clubs from callawaypreowned.com over the years and my best buy was a set of 4-A Apex 19 irons "like new" on sale for $625 (over 50% off retail at the time). Their prices vary and you can find bargains if you check regularly and have an idea about what you want.