Unless you have a problem with the weight of the 13 inch pro vs. the MBA, or with the MBP keyboard, and are willing to accept that the MBA would be "lower powered" in some cases. I would recommend keeping the MBP for now, as it is still relatively new and awaiting the release of new MBPs (hopefully with better keyboards) as that would give you more options. Especially since you own the MBP already and do not need to cash-out in order to keep it.
I just got a MBA 2020 (i5/16/256), but I use a company provided 2018 13inch MBP (4P 2.7-i7, 16, 512 .. so pretty high spec), and while (a) understanding the spec difference of MBA vs MBP and (b) the MBP actually personally feels hotter than MBA under similar use (zoom, office, chrome, mail, calendar, etc.) .. there is something to be said for the extra oomph that is provided by a higher spec machine, especially when opening 44MB sized PPTs or other "heavy" items.
The only major cosmetic difference (personally speaking..) is the keyboard, and that is the reason why I decided to purchase a machine for my own use now .. I wanted to have the peace of mind that this was not "faulty" by design, as I hate to go to repair shops.. I like the MBA keyboard but, quite honestly, I can live with the feel of the MBP 2018 keyboard which has not caused me any problems as of yet. Having used your MBP for a while, YMMV on the keyboard reliability side.. but, for me personally, the keyboard was not the game-changer that I thought it would be prior to the MBA purchase.