You could use the following to sort all loaded layers alphabetically:

from collections import OrderedDict
root = QgsProject.instance().layerTreeRoot()
LayerNamesEnumDict=lambda listCh:{listCh[q[0]].name()+str(q[0]):q[1]
                                   for q in enumerate(listCh)}

mLNED = LayerNamesEnumDict(root.children())
mLNEDkeys = OrderedDict(sorted(LayerNamesEnumDict(root.children()).items())).keys()

mLNEDsorted = [mLNED[k].clone() for k in mLNEDkeys]
root.insertChildNodes(0,mLNEDsorted)
for n in mLNED.values():
    root.removeChildNode(n)

Credit to @MikhailMinin with his Sort Layers plugin in which the above code is based.

You could use the following to sort all loaded layers alphabetically:

from collections import OrderedDict
root = QgsProject.instance().layerTreeRoot()
LayerNamesEnumDict=lambda listCh:{listCh[q[0]].name()+str(q[0]):q[1]
                                   for q in enumerate(listCh)}

mLNED = LayerNamesEnumDict(root.children())
mLNEDkeys = OrderedDict(sorted(LayerNamesEnumDict(root.children()).items())).keys()

mLNEDsorted = [mLNED[k].clone() for k in mLNEDkeys]
root.insertChildNodes(0,mLNEDsorted)
for n in mLNED.values():
    root.removeChildNode(n)

Credit to @MikhailMinin with his Sort Layers plugin in which the above code is based.