To be competitive you’ll probably find you need to unlearn a lot of things you learned in the past half decade.
Yes, that's likely true, as I was never before that interested in long range shooting simply because I had no access to a range of sufficient length. Now I do. I have 300 yards 18 minutes from home, and 1000 yards 2 hours from home. The 2 hours each way for the 1000 yards is not great, but the 18 minutes each way for the 300 yards is terrific compared to the past!
The handloading processes needed for longer rnage accuracy have indeed been a revelation (I read Zediker's "Top-Grade Ammo" book very carefully and follow his methods).
But the body positioning and proper use of accessories is the biggest current challenge, since I "don't know what I don't know". THAT's what I am seeking here, and now also on Benchrest-specific sites.
I don't expect to be "competitive", especially at my age and with my eyes (70 years and with replacement eye lenses and laser surgery done 5 years ago). But I really enjoy shooting and handloading, and THAT's my objective.