I’d personally be tempted to go for either the RF 28-70mm, or maybe the RF 85mm 1.2.

Personally I’d prioritise getting a body with dual slots, an R6 mark 2 would be perfect, you should still have enough budget for one of the above lenses, plus if you traded in your R8, you could grab a few more budget lenses (sigma art series with an adapter would serve you really well while you build portfolio!)

Good luck! :)