And for some reason, OP is fixated on the thought of disabling change address will fix his high transaction fee issue.
At this point, I wont add anything that's already been explained here.
Consolidating addresses every once in a while by sending yourself transactions from 5+ UTXOs in an address or a few, to another address will make one UTXO, will save you fees if you set the feerate low enough like 5, 4 stats/vbyte and the mempool isn't jammed like it is now.
Right now an 8 sat/vbyte transaction is 51MB away from the tip, so now is not a good time to consolidate any UTXOs into one because extraordinary fees will be paid.