Hello, I haven’t done any rated PvP since Shadowlands, just a couple solo shuffles with my resto druid and that’s it.
I got to 1800 in 2’s, 3’s and rbgs with hpriest, hpala and resto druid during Shadowlands. Life has gotten in the way and I only have time for one character now.
I would love to go above 1800 and currently looking for a class that is always wanted in arenas and rbgs and that could help me finally break 1800. It could be dps or healer.
Any ideas? Thanks! 
If you are good and play healer just do RSS for 1800. Qs are fast for healers and if you win you’ll get it quick
If you have some moderate experience, which it seems like you have, 1800 is super easy on all of them.
Just Q whatever you enjoy, but the best healers ATM are:
Hpal
Pres = Hpriest
Shaman = MW = Druid
Disc
The healing meta is the best I can ever remember it being; disc is @ the bottom currently but is absolutely by no means bad. Every healer is really playable at the moment.
Any healer in particular that you would recommend? Not just flavor of the month, but I would like to stick with it going forward. Thanks!
My advice is pick the one that you have the most fun with and focus on it. The strong and weak times will come and go.