Given you have a budget of $1,500, the projected R7, when it finally becomes available (as opposed to announced) and being a prosumer unit, will not be cheap.
So, if that is too rich for your tastes, given that you are shooting people singly or in groups, you could likely pick up an RP very cheaply. A crop sensor body has disadvantages at the wider focal range end, but advantages at the telephoto end. The RP is a FF unit, so the ability to get shallow DoF with fast lenses will be a benefit. Given you are currently using a crop sensor body, if you are using EF-S lenses, you can use them with the RP via an adapter, but that will drastically reduce the MP count by a factor of 2.56: so that would give you a MP count reduced from 26MP to about 10MP. It would be helpful to indicate what kinds of images you produce - i.e. digital, small prints, large detailed images. Depending upon what you are producing, that might be fine.
Another alternative is to go for one of the last APS-C DSLRs - you could likely pick one up refurbished within your budget. The 90D has a good 34MP sensor, and a lot of upgrades from your current body. However, the higher resolution will put pressure on your older or cheaper lenses (worth listing those, please).
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
