Probably premature to ask the question. There don't seem to be any rumors that updated iPad Pros will be released in the near future. An Air 5 will likely be announced at the early March event. So the trade in value of your 2018 iPad right now is probably not what the trade in value will be when the 2022 iPad Pros are available. And as others have noted, there is absolutely nothing obsolete with your current iPad. The A12x was and is a very powerful processor. Sure the M1 in the current model benchmarks faster, but the performance differences will be moot unless you do some heavy lifting with your iPad. Might make a difference with some games? I'm still using a 9.7" Pro with an A9x (I think, at least it's some variant of the A9) and it's still mostly meeting my needs. But other than a little light photo editing when traveling, my uses place few demands on the processor. I am planning to upgrade in the not to distant future. Battery life on mine is not nearly what it once was and I suspect it won't run the next generation of iPadOs.